Why does click & drag still work for a locked score?

I'm going through some unimplemented commands in MuseScore v4, and one of them is "lock".
But I noticed in v3 that even after locking a score, if you click and drag to pan the score it automatically exits "lock" mode, and worse even after locking again, you can click and drag notes around, which automatically takes you out of lock mode and leaves you with a modified score.
What's the use case for this, because preventing accidental modification from click and drag (while trying to move the score around) I would think would be very useful, in fact it's exactly what I've wanted a few times.

Personally I'd expect in "lock mode", click & drag would only ever pan the score regardless of what you click on.

Also quite a lot of commands like "page up"/"page down" etc. don't work in lock mode which I'm not sure I understand the reasoning for.

I noticed @jeetee raised an issue for it https://musescore.org/en/node/311604 but figured it was worth raising here first before starting on any implementation for v4.