It should be common sense that putting 30+ headphones on a ultimate tier list is impossible, when I haven't heard some of these headphones in years.
It's illogical to compare a headphone I've heard recently to a headphone I last heard 3 years ago. Memory is not something I or anyone should trust, especially when it comes sound last heard months to years ago.
I DON'T own all these headphones. Doing ultimate comparisons based off memory is just not something I or anyone shouldn't feel confident about. This is why I tell people that A/B comparisons are incredibly important, like when swapping pads, getting your headphones modded, etc. So much expectation bias, etc. I never trust those who send their headphones in for modding, get them back, and gush about how much better they became.
Unless I had headphone A and B directly on hand, (and at the LEAST, if I no longer have a headphone, it'd be something I had very recently), I would feel like I'm giving false information about how well one headphone compares to another.
I feel, and it will always this way: I will review and score a headphone based off it's own merits. That is final. If you want to know the percentage headphone A is better than headphone B, buy them yourselves. I'd like to think that I give just enough information on a headphone's characteristics, it's pros and cons to see if you'll like them. My scores give you an idea how I feel they perform in the grand scheme of things. Are they good for gaming? Yes/no. Are they fun? yes/no. Are they comfortable? Yes/no. How good? Great, which is better than good. Amazing, which is better than great.
Other reviewers may have an ultimate tier list, but I'd like to believe that it's because they have those headphones on hand. I, do not.
Take that as you will. Not going to change. The only thing that changes is the evolution of how I write reviews. I started this guide to have some personal database. It wasn't going to be a guide on full reviews. It became that down the line, but all I wanted to do in the beginning was add headphones, and a short summary if they're decent or not. You can see this in my older reviews (like the D7000, or AD700). The guide grew it's own legs, and evolved, but there's just some things that are impossible to do, and comparing headphones so in-depth is impossible.
Another thing that needs to be understood, is that some of the entries are incredibly old, and not updated. For example, I said the DT880 was the most balanced headphone I had ever owned. At that point in time, it was. I have since heard better, but again, it doesn't make the DT880 worse. Hence why I say, take the reviews on a per headphone basis, and understand some of the entries are a bit old and don't reflect things I have heard more recently. I do need to update these things eventually, which is my own fault in these regards. I'll have to refrain from saying things like that, since there will always be something better down the line.
I have also added a sort of tier list at the beginning of the guide, to show which headphones I favor for fun, competitive, all rounders. That should be a GOOD place to start, when it comes to what I find worthwhile on this guide.