That's one complaint I tend to ignore when seen mentioned, since the problem for me isn't that the stealth is forced. It's fine to have a stealth mission if the stealth mechanics work. The problem tends to be that it's not just forced upon you, but also sucks shit making it more frustrating than it would be if the stealth mechanics were good. When shitty stealth is optional, nobody complains. When good stealth is forced, nobody complains.