You don't need it for everyone; you can throw knives at simple weaklings, but grenades are enough for robots and the Enclave.
Yeah, and you'll get kicked out of any party within the first 10-20% of the dungeon, because two buttons aren't enough for a decent tank, and you can easily break aggro with standard attacks without using skills. And regarding the blade – all the mobs are hitting you, it's stressful.
Well, let's talk, Vasya. I see you've gotten confused, are you being rude? Why is your hair so long? Why don't you wash it? Here, hold this flashlight.
An absolutely boring class, no intrigue, no walking on the edge, 2-3 buttons: invisibility, backstab, sprint. Kill priests who are AFK and get owned by everyone else.
What else will you say? Will you advise me on what armor set to buy? How to upgrade weapons and what tattoos to get?
Except the ones we've made