Personally, I am also in the minority and do not like Phonak PFEs. Yes, they are very clear and very extended, especially when amped. The sound is also quite spacious for a single driver IEM. I don't have a problem with them sounding thin either. However, I feel that the PFEs are seriousily lacking two things for them to be high-end or even solid mid level IEMs: 1. tonal accuracy; 2. micro detail. First of all, I feel that PFEs do not really sound accurate in the sense that their tonality is a bit off. In particular, I feel that they sound unnaturally lively, especially for "serious" music, such as jazz, instrumental, classical and stuff like that. Apart from sounding tonally off, the PFEs also lack micro detail and by that I mean all the little reverberations and overtones naturally present in any recording. This makes them sound quite schematic. In this respect, they remind me somewhat of Yuin PK2s, which also lack micro details. However, unlike the PFEs, PK2s don't try to sound all fun and "happy" - they are more realistic and tonally accurate. PK2s don't make beautiful, complex instrumental music sound like children's music. PFE's coloration and lack of micro details, on the other hand, make some of my favorite instrumental and jazz recordings sound like they were recorded using cheap computer samples.
Now, I am not saying that PFE's are bad. No, technically they are not bad at all, especially for the price. They got great extension both high and low, great clarity, great balance of mids, highs and lows when amped and excellent ergonomics with a very comfy fit. And they do work very well for some of the poorly recorded modern pop, rap and dance where the overtones in the recordings don't add anything to listening experience anyways and where tonal accuracy is of little importance. However, for listening to serious music seriousily - to be able to hear all the emotions, all the atmosphere than the music carries the way the artist meant them to be heard - I believe that there are much better options out there for a similar price or a bit more. Q-jays come to mind right away - very detailed and accurate sounding IEMs. Sleek SA6 can also be found for around $150 sometimes, especially used and I also find it to be much better than PFEs for tonal accuracy and revealing micro detail. Even UE Super.fi 5 Pros are better IMO. They are not really accurate, they have coloration, but at least they let you hear all the details.
Of course, this is all just my very subjective, personal opinion, so take it with a grain of salt. If something sounds good to you, then it's good.
P.S. Perhaps, I wasn't getting a good fit with the PFEs, but that is unlikely because I hear the deep bass and the sound was sufficiently full. Oh and sorry if my description of the flaws wasn't very clear and technically accurate - I kinda wrote this in a rush and I am also not that good at describing sound in detail. Hopefully, you'll understand what I am getting at though.