Since the new library update, it's been causing issues for people who normally HAVEN'T had issues with prior versions of Steam, any other game launcher ever, and a variety of games. It's not just affecting people with epilepsy (which is a condition you're grossly misunderstanding and misrepresenting with that comment, btw), but migraines and vertigo, as well as some autistic spectrum users. It's been a problem for over a year, and the closest to an official response so far has been to make it worse by blocking access to the safe workarounds that used to exist. The link I posted earlier was a recent post by a Steam community moderator, but there are older topics about it too:
https://steamcommunity.com/discussions/forum/10/1745643015563656613/
https://steamcommunity.com/groups/SteamClientBeta/discussions/3/1658943116231004...