This is personally where I have the most issues with yunohost. If something isnt kept up to date with their apps, updates can go wrong and break the app. Ive had this happen with Peertube, Pixelfed, and other services. You update and the service just stops working.
But still more had no issues at all. And the backup system that comes with the system makes it very nice.
Most of the time its a non-event to update and maintain the system. Im tempted to have two machines. One with stable apps in yunohost. And the other with experimental stuff like fediverse software with docker. One I can blow away if need be and one that uses rock solid services.