I have no problems with pedal-assisted vehicles or scooters on proper bicycle paths that are at least 2m wide (per direction, so 4m if there's oncoming traffic). There overtaking isn't an issue, and 25km/h vehicles are somewhat average in terms of speed is there's no incline (leisure bikers are slower, while a good road bike goes faster).

The problem are those 0.5-1m wide "bike lanes" they squeeze in as an afterthought in cities. Overtaking on them is basically impossible without breaking some rules, so scooters and pedal-assisted vehicles make it worse than it already is.