Not every work environment is the same.
When I first started with my current employer I was given a system with RHEL preinstalled and I replaced it with Fedora on my first day. I was told to use LUKS and given a normal OpenVPN profile but otherwise they don’t control or monitor anything about my workstation. No matter how many years or decades I stay at this company, it’s extremely unlikely I’ll ever touch an OS that isn’t Linux-based during work time.
Every previous job I’ve been at also had me use Linux for my primary workstation, because my field of work more or less requires it, but some have needed me to access a separate Windows system/server/VM on rare occasions.
My experience as someone who has barely dabbled in Matrix, tried comparing clients, and knows a lot of people who stick to Discord: a lot of Discord users heavily use custom emotes, voice chat, and screen sharing. It’s not even easy to figure out which Matrix clients support each of those features without installing everything and trying it out. There’s a clients comparison on matrix.org that mentions Voip but not stickers or video.
For stickers alone:
Being able to freely use custom emotes without paying for a Discord Nitro subscription nor server boosts would be a great selling point but it’s not something most users would be able to figure out before signing up. The limited client support isn’t great; e.g. Fluffy is the only Android client that supports sending custom stickers but some people may dislike the chat bubbles style UI.