Huh? Tier lists are literally just an aggregation of PSU reviews from trusted sources, weighted by the manufacturer. It's a public service, nothing more.
The last good one I saw was started on jonnyguru.com on a google spreadsheet maybe a decade ago and even that one went into seven tiers+ with the people working on it saying they needed more tiers to clearly state the differences between units. Look tier lists are better than amazon reviews of "I got a 700w PSU for $45 and it works great on my PC" (that only needs 300w tops) but if you can post on web site looking for advice, you can also look up professional reviews. In fact both HB and Toms have "best of" lists by Aris which are far more helpful than a tier list" as well as his professional reviews (plus sites like TPU, PCgamer, etc.,)
My issue with tier lists is long but here are several (they do not always apply to every single one)
Rarely do they fully explain the performance the consumer is getting for the extra price which they may or may not need (or possibly need more)
Reviews used int the "tiers" have scores and ranking but are not reflected the same in the tier because...
Lots of OEM & Brand bias even if the platform has a known issue or a very good unit that may come from a "lesser" OEM
some units get carry over grades even if they have no review just because they use the same platform (even if the parts are cheaper) and vice versa
some OEMs can do no wrong and get high ranking even if the platform has never been reviewed, some oems can do no right
just because brand A has a better 650w PSU than brand B does not necessarily mean brand A's 750w & 850w in the same line are better as well. See best of reviews for examples
some OEMs hang their hats on different aspects (such as hold up time) than others which don't care too much about it.
frankly, an RMA list & QC results would be more helpful
So educating oneself to their needs is more important than checking on a tier position after all no one buys a Intel 13600k and AMD RX 7600 XT and says "hey what tier is my CPU & GPU at?"...or least they shouldn't