Other than that it's obviously by design. There is no reason to speed at constant 50kph in a city. Nether for a car, motorbike or e-bike.
Which does two things, raises state revenue and causes drivers to spend way to much time concentrating on how fast they are going rather than driving to suit the conditions and paying focusing to what’s going on in front of them.
And don’t get me started on the pot holes.
I’d rather be in flow state while doing any of those, than constantly be yanked out of it because I’m concerned I might be do 3kph over the legal speed limit.
And to make it a two-for-one special: roads shouldn't need speed signs to begin with. The road should be designed for a certain speed, so that driving any faster feels uncomfortable and unsafe. If it is physically possible to drive 80 in a 30, something has gone terribly wrong already. Roundabouts are a great addition to this: you can't exactly speed through them, so you are forced to slow down.