I didn't know that D&D should cater only to you.
Well, it should.
Seriously though, it would be nice if they did at least once in a while... But it caters to the 60% rule and we all know it. Fortunately, the game plays fine if you remove things you don't like and many tables remove things as well as add homebrew/houserules. Even with the UA content our table has approved of,
none of it has seen game play. We don't even have that much that
used to be UA content, but made it into a book (e.g. the Samurai sublcass in XGtE) that has seen play at our table.
I would rather see UA content that I would use and pay for if published in a book than crap like this then I never would. If this stuff makes into a book, I won't buy it and just be disappointed yet again as they appease the 60%.
To me the problem becomes one of buyer's remorse. If 90% of the material in a release is something I don't want, it would suck to shell out 30-50 dollars for the 10% I do.
Maybe they will eventually release a revised and compiled UA book with all the accepted material after playtesting? If they do, hopefully enough of it will be worth buying to more than 60% of us.
