I used to have 25/5 and from time to time it was tight for me alone (but I never fiddled much with QoS settings).
Under "normal" usage it did work, but then there were from time to time complications (e.g. OS update, Android update/installations, send/receive funny videos, etc...) and then when 1.5 years ago it became from time to time as well difficult to work from home (bigger SW-updates on the company notebook, more communication by antivirus/antispyware/antiwhatever) I gave up and changed to 1gb/1gb fibre => with what started happening last year I've been veeery lucky to get it just a few months before that the whole Covid situation made working from home a permanent situation :)