Ignorant people like you conflate multi-boxing with people who basically bot. There are TONS of casual multi-boxers, and you didn’t know it, because they were just minding their own business PLAYING THE GAME.
I first manually dual-boxed starting in BC, and then triple-boxed when they came out with the new RAF. I use one pc per account. I use one input device per character. I only ever used addons that use Blizz’s own API. The only things I used to even help me, were something that strobed “follow”, because regular, non-strobed follow has (deliberately?) been nerfed into the ground, and is fairly useless now, and mounting. That’s it.
I just leveled my characters, did world quests, and solo’d old content. I often invited people to group to help them, and they never even realized I multiboxed.
As my physical disabilities have worsened, being able to multibox actually helped me, because even with the badly nerfed DPS I did, it was still lower key than my trying to intensely play one character (my hands are pretty badly disabled and my motor control is compromised).
While it sucks that casual multiboxers are punished because of how Blizz addressed paid, unattended dungeon and raid carries, the worst part is how it affects the disabled.
Not just me, because single boxing IS much harder for me, bizarrely enough, but because there are other disabled players, , that are effectively screwed now.
And Blizz knew this. They were TOLD this. And doubled down on being their usual ableist, toxic selves.