Even if I have reduce transparency on its still ugly, plus you can't use shortcut to change the icons because there will always be a border around them. And under all of that there are countless bugs even in the official build like widgets going solid then back to 'liquid'. To downright crashes.
I also did submitted feedback back when it was in developer beta, however mostly for bugs since I doubt they want to hear my personal opinion on their design. That being said I think the best feedback I can submit is with my wallet. I will keep my iPad because Samsung isn't serious about tablets, but for phones I will be sticking to OneUI at least until Apple's software improves.