I have no problem with monk's having the best mobility in this game.
Neither do I.
I have with the fact that jump only consume 3 meters no matter the distance you cross when you use it.
Just try a few more and it is even worst that what I thought.
With your "DnD" exemple (66 meters), it mean that in BG3, if you jump rather run/move... You can cross 352 meters with a level 12 monk that have 20 strenght !
Consume all your speed walking/running = 66 meters
Consume all your speed jumping = 352 meters
In game I have 39 meters of speed when I use step if the wind : dash.
If I run / walk : I can move 39 meters farther during my turn.
If I jump : I can move 208 meters farther during my turn.=> this is just ridiculous and it is only due to the ressource cost of the jump.
