Well, sadly there's the fact that Discord has finally pulled out the official laser beams for the alternative client scene, such that Cordless recently called it quits:
https://github.com/Bios-Marcel/cordlessRipcord (https://cancel.fm/ripcord/) doesn't seem to be giving any indications that it no longer works, but ¯\_(ツ)_/¯ (and probably for fairly large values of ¯\_(ツ)_/¯ too)
My computer is generally only able to handle one Chromium-based HI I EAT ALL YOUR RAM AND GPU, so I basically treat Discord like email as a result of the no-3rd-party-app policy. Given that the Discord "app" is just Electron, it'll get in a fight with the poor thermal design of my laptop in exactly the same way on the website does.
This being said, it's very difficult for me to argue loudly against the position they're, because it's complicated.
Discord has scaled to the point where "13 year old skiddies who like pulling legs off spiders will use any alternate clients they find [which don't include anti-spam protection] to send a {server,reputation}-destroying level of spam" is having a more measurable impact than "we need to maintain equality of access". I suspect that extremely strong management vision+competence would be necessary to prioritize this - as things stand right now, it's incredibly easy to deprioritize because the vast majority of people using Discord either have minimally-viably decent machines appropriate for playing games or completing actual day jobs.