1. reading dialog cards, especially since I can lip read a bit and that's not what the characters are saying
2. the truly awful "period" music added
3. the grainy black and white
I've seen some work on the 1929 film "Wings" that was done in high def, sound effects were added, and some small colorization of scenes.
I'd like to take that further:
1. remove graininess and fuzziness with AI, and of course all scratches, etc.
2. add foley sound effects
3. replace dialog cards with dubbed dialog, lip read if possible
4. add a decent music sound track (Like what was done with "Metropolis")
5. colorize it!
These are all very doable today, as I've seen each done in a small way.
Why should we suffer all the limitations of silent movies? I just want to enjoy it, not suffer.