Right, but we're talking about few millimeters (not centimeters) of difference between bricks, which are not comfy but not too extreme if driving on any bike at ~10km/h => advantages outweigh disatvantages.
Bikes being the least problematic opponent group, I would be more worried by skateboard, inline-skate, etc... opposition groups.
In Switzerland we solved it (as long as it was implemented by the local community or city) by having very smooth sidewalks (but bikes still have to drive on the street as they're too fast for the sidewalk and have more than enough suspension for the normal street at normal speeds).
Bikes being the least problematic opponent group, I would be more worried by skateboard, inline-skate, etc... opposition groups.
In Switzerland we solved it (as long as it was implemented by the local community or city) by having very smooth sidewalks (but bikes still have to drive on the street as they're too fast for the sidewalk and have more than enough suspension for the normal street at normal speeds).