Hi @NewBee117,
I would personally search for the flows, that I suspect are no longer used, via the Power Apps Search Pane to make sure it is not used throughout the app.
As for benefits, I wouldn't expect any big performance or in-app noticeable benefits. That being said, I would highly recommend to always remove unwanted or unused dependencies within your apps and solutions in general. (think of connection references, tables, flows, variables, collections...)
Although on an individual level they might not have a big impact, it will make future maintenance or handover to a colleague easier. Additionally, in bigger projects the amount of unused code & solution components in general can stack up very quickly - resulting e.g. in longer deployments due to the bigger solution size.
If this solves your question, would you be so kind as to accept it as a solution & give it a thumbs up.
Thanks!
