lack of courtesy accidentals creates problems for ties vs slurs.
This is basically a request for the courtesy accidental feature. I've been having problems with music I've annotated in MuseScore when it comes to rehearsing / performance.
Basically all the players really need courtesy accidentals.
Whilst I can argue that an accidental should disappear with a barline, it's much more difficult when it comes to tied vs slurred notes.
For example if you're in Cmajor, and you have a whole note F# tied over the barline, the second bar doesn't show the accidental when it's a tie.
It does show the second accidental if you used a slur rather than a tie.
So this creates an ambiguity - "am I looking at an F# slurred to an F nat, or a tied F# ?"
Fundamentally ties are not visually distinct enough from slurs, so someone looking at this might think it's an F# reverting to an F natural. The results are not particularly pleasing usually.
If people could rely on courtesy accidentals, they could view the lack of the natural accidental as indication that the # accidental is retained.
A related bug is that if you have a score, with parts, if you add an accidental to the score, it's not copied into the part. This is very painful (also see this with slurs)