Meh, not sure how most of your points are negatives. No website to open but you have to open a program instead, not sure how that's some big hinderance. And just like amazon, there are still games you have to copy the keys to activate the game, they both have copy to clipboard buttons to even make it easier too, it seems like you totally have loyalty to steam since they have the same functionalities but one is a program, the other is a browser.
I've recently liked amazon more for when they attempted to make some games DRM free that weren't previously and when I go internationally, I have to use a VPN most times and steam won't work with the VPNs where as I can download anything in a browser and install so that's what pisses me off with steam but obviously a niche problem. I've also had problems with steam customer service but have never had a problem with amazon's.
There's no problem with your bias at all or your preference, it's just that both of those are applicable to both services so I can't see how they're negatives only for amazon.
Edit: Plus, many games will also redeem on steam (but obviously not all) so it's the best of both worlds. You have amazon and you get a free steam one also. They even started offering steam keys for games on their websites that normally wouldn't redeem on steam.
