Ok, i normally avoid being rude or inflammatory, but at this point, lets have a proper discussion. I will try eliminating all bias and objectively dissect any confusions i might have.
So you claim there are "so many alternatives that offer way better sound and build quality" for $50? I have been looking my hardest for the last 2 months to find more iems of the same caliber that compete or outshine the Zs5/6. As expected i found only a few, these include: Tin2 and brainwavz b100. However, there is a caveat,
1: I did listen to the T2's, they are damn good but at $40 USD, they dont blow the KZ out of the water at half the price $20/$12. Infact, the bass is lacking a bit for my taste and misses extension which is not a deal breaker, but i listen to a lot of rap (kendrick, drake, post malone and so on)
2: I havn't heard the brainwavz b-100 but they are tuned very differently. They are also $50 so i wont comment on them since i have no experience
At this point, you might bring up a "marshall modes" comparison, but i have completely dealt with that and debunked that it sounds close to Zircons, with less treble and more defined mids. They are deff bass boosted iems i would not at all be interested in, since i have a plethora of those. (I made a comprehensive and objective post which the mods deleted, go figures)
Now here is the dilemma, i can not trust you if you only say: "Marshall Modes are better" and come up with no other name. Yet, you constantly say this: "There are a lot of better iems under $50". As far as i know, i have only found 2 iems as stated above that are $50 and compete well. Now obviously there is sound preference in play here, for each of us, but we can still agree on some basics after owning so many iems. So i believe we can judge specific characteristics accurately and leave out bias (i.e mids, bass and highs)
At this point, i own Zircons, Remax D610s, Swingie80, LZA 3a, blitzwolf (coming soon) Boarsmen , Dzat and Sennheiser momentum's. As you notice, some are very bass heavy and differ from my only 2 kz iem (zs5 and 3). So i can assure you, its not me being biased and trying to "protect" my cognitive dissonance by forcing myself to believe since i spent $ on kz. ( It does outclass my $120 in-ear sennheisers). Clearly you noticed im trying to achieve variety with my gear but i used to have a distinct preference of heavy low end (Which is the opposite of zs5), but that has changed over time.
At this point, i want names of youre so called "better iems" under $50. Not close and ties with the zs5, rather what you said yourself. "BETTER".
I actually asked you this in the past i believe, but i just kept getting marshalls. If need be, i will rewrite my findings of the modes and explain exactly why i believe its nothing more than the plethora of bass boosted iems (youre run of the mill sub 20 chifi iem). As far as the KZ goes, you dont own the Zs5 v1, which i believe is the best iem i own. So i wouldn't expect you to yell they are treble cannons, since they are not (only 1 BA near nozzle, and foams enhance bass even further). I have heard the zs6, and i will agree, there is deff more emphasis on the high end. Infact, its sibilant to my ears (Fall Out Boys: last of the real ones). However, i can get around that with foam tips...weird but it works for me. Yet, i didnt buy the zs6 since i find the zs5 v1 to be more suited for me and very similar sound wise. (As stated, i want variety in my gear)
Lastly: Its ok to have your'e opinion. I can totally see why you might think the Kz's have exaggerated highs (which it does at times). However, that does not mean youre absolutely correct and everyone might perceive it as such. Judging from youre fondness of warm sounding iems with boosted bass (yes modes have boosted bass, like my zircons) its pretty much expected. Heck, i was a sucker for overwhelming bass, hence i have zircons and dzat. But for me, over time i realized, the Zs5's sounds mighty superior for Jazz and has much better instrumental separation, pleasing yet not overpowering punchy bass and excellent reproduction of live recordings (And unlike bass boosted iems, they dont muddy the mids or bleed into it) . Do i listen to my zs5 all the time? No. Do i treat it like the bible of cheap iems? No. Do i think its absolutely amazing and punches far far above its weight? YES. The point is, opinions and preferences change over time, but i believe its no right to state opinion as facts. According to you, Sennheiser HD600 can be trash due to it being bright, but that wont be "Fact". Just what you think.
Now, i will be patiently awaiting your'e response, and see where i might have messed up or how i might have not found "Much better iems" under $50.
Edit: If i was a kz fanboy, i would get the zs6 and horde them. But im a poor university student that wants variety, hence i digress.