You’re a grey hat. Technical problems like these are likely to never get fixed until their consequences are demonstrated.

Sympathies. Chronic vertigo is horrible, especially when it leads to nausea. Hope you find an effective treatment soon.

As others have said, it currently does not. A workaround that works pretty well, and which I use, is to create accounts on multiple instances and use them as “multi-lemmies” by moving your subscriptions between them according to theme, topic or whatever else you want to group by. A password manager like Bitwarden can help with generating passwords for and keeping track of the different accounts.