Now manufacturers are possibly prioritizing the highest grade panels for non-gaming use and using extremely expensive gaming monitors as a dumping ground for everything else.
For example, the 28" UR55 has few complaints about backlight bleed and in my experience with having bought several is a reliable choice. Meanwhile the oddly similar 28" Odyssey G8 is known as a "buy and return until you get one that's ok" type of monitor, as are many other gaming monitors these days.
Gamers seem conditioned to just accept inferior panel quality as long as the other specs work, while business and casual customers would probably just buy another monitor if they saw weird issues. They might not know the term backlight bleed, so they'll still see it just fine.
And hey, those wasabis and catleaps got you a 1440p IPS panel that did 90% of what you want for 50% of the price at a time when 1440p and IPS was still kind of rare to own. Most people who got one were upgrading from a typical TN so even a crappy IPS looks good in comparison. I was playing eve online at the time and caused at least 10 people in my corp to buy them when they saw how much screen estate you got at a higher res.