I don't mind the stealth, but that mission is attrocious in making you do certain things in a certain order, and giving you no hints or markers so you're forced to guess what to do and if you don't figure it out fast enough you'll run out of time

At least with Thancred's mission it's more cut and dry what you need to do, here you would expect to be able to stealth all the way to the encampment but there's a random barrier blocking you