Electric scooters have the same problem with segways in that they are too fast for sidewalks but too slow for bike lanes. And when you want to make a left turn, the scooter just can't go fast enough for you to safely merge onto the left-turn lane for cars like a bike can, so you end up waiting for two traffic lights like a pedestrian.
I use my scooter a lot in San Francisco and I’ve found that I’m normally going faster than many of the bikers in the bike lane (>15mph). I also don’t have that problem turning, although sometimes I cheat and kick-scoot at sidewalk crossings. It would definitely depend on the environment though - I’m sure in more heavily suburban areas with faster speed limits, more lanes, and less stop-and-go they would not feel safe to ride around cars. But I do think they’re pretty compatible with biking infrastructure
After 6 months of practice only few bikes were faster than my scooter (25 km/h), I never experienced issues with turns.
Only issue is the rough roads - when I want to ride on the rough roads I use bike.
In every other aspect e-scooter is better: doesn't require special outfit; I don't sweat; it's compact enough to take it to the shop or cafe (without bending); less details I need to care about - pedals, brakes, speed switches, saddle - I just use what I've bought and it works fine. My bikes usually worth ~$500 (same as e-scooter) and they requiere some fixes/replacements from time to time. Scooter had just one flat tire replacement, that's all.
No they don't. Electric scooters are definitely fast enough for bike lanes. Most cyclists in urban areas are only going like 12-15 mph, well within electric scooter speeds.