Nearly 500 seriously injured in e-scooter collisions in Great Britain last year
(www.theguardian.com)
Completely agree, treat them broadly like e-bikes. Limited speed and use only on roads and bike paths, not footpaths.
That said, I see a lot of people riding e-bikes which don't comply with the existing e-bike speed limits, so perhaps better enforcement is needed as well. There's definitely a place for these faster e-bikes, but they're basically e-mopeds and should act like it (roads only, driving licence, number plate, MOT, insurance etc.).