I find small boosts, such as a +1 to AC, really useless in games. In 19 out of 20 attacks, that one AC won't make a difference. Unless you can stack that with a whole lot of other +1s and +2s, it's not going anywhere.
Meanwhile, Great Weapon fighting is necessary to get the best out of Great Weapon Master. With the accuracy loss, you need all the damage you can get. Bless only helps so much.
If a character being downed is dangerous, that's a general weakness of the party. The problem isn't Lae'Zel, it's not having a healer. In my two paladin playthrough, they ran around with 14/15 AC happily and it never even mattered. The eventual 15/17 was an upgrade, but underwhelming.
A character, specifically /Lae'Zel/ being downed was very dangerous in my caster class playthrough. If she was down, there was no picking her up again. The enemy would target and down her before she even got a turn. That made her useless.
So, it's true that Las'Zel has no tanking ability. However, that +1 AC will mean she sucks -5% less at tanking for casters, and a whole lot more in melee parties that can heal.
The crux of the matter is that you can't just have a tank and call it a day. You need a healer and a tank, or you should go full glass canon. What dies quicker can't do damage.
First of all, The idea isn't a +1 to AC, it's getting SOMETHING out of her fighting style if you don't want her to be a greatsword fighter.
And every +1 helps I STILL can't beat the Nere fight even with a full level 5 party, all with 19+ AC. There are just SO MANY attacks coming at you that there is no way to heal past that. I can chease it to beat them, sure, but even with fireball and glyph of warding at my disposal, I die EVERY time. I'm on like my fifth try with a paladin and I just die every time. The Gnoll fight? The
And If your response to the above is "yadda yadda Oh I can beat it on hard mode with one character you are teh such" the STFU and sit down, that's not helping, that's you contributing to the toxicity of the boards and literally being a trash human being. If you wanna give me pointers that's fine, but I don't give a damn about how much better you are than me at a videogame and how I should kill myself for being bad at it.
Sorry. . . just. . . that Nere fight is stupid and deserves to be toned down.