Well, it's different if you ask me tbh. As you said, the sgs became shit in v7 (if i didn't missundertood it) and became good again by the rebalance of sgs. Instead, in the case of pve items, they've TOTALLY deleted, so you should've re-hunt the items. This is like if the SGs you've bought with coins were totally deleted and you need to rebirth your character again for get them. You get the difference between these 2 cases?
If you mean the walls that are annoy, they're on the last stage of the Act 4.4. Don't have any screenshot because well, just completed it a couple of times, and didn't complete it again or took the time for get screenshots or a video about it cuz it's so annoy and was sure McSic or Dave will not do anyrhing about this just seeing the case of 2.1-2.4 acts glitches. But basically, the walls are in the center of the map. This is annoy because if you want to dash for dodge the robots thst flip you, this stop you and they get you.
About the glitch on act 2.1-2.4 that doesn't let you finish the quest, i've remembered 2 things. On superflip map, on the dodgeball place, there's a invisible ground that save you from fall into oblivion, idk if it can be possible, bit might this can let you recicle it for the glitch. But in the case you can't, in scrider's map this is already solved, when scrider spawns npcs out of the map, i've realized that they don't get the same glitch as the acts i've previously said, so maybe you can use this map for bosses' stage? I think it should work. Anyway i'm totally free for test anything if it's needed.
Well, english is not my main language, neither i'm an expert on it, and add it that i'm so bad explain my ideas sometimes, making me enter in contradictions because i don't know how to say exactly what i mean. But since there's no one that wanted to say this issues with quests, had the feeling to do it.