In Sweden - and most of Europe AFAIK - the rules WRT power and allowed speed are clear. Anything bought from a store and kept stock won’t have any fuzzies to it WRT power and allowed speed.
Design-wise, We don’t get much of that motorcycle styling. There are some high-powered off-road two-wheelers that look fairly similar to dirtbikes, but that’s more through necessity than styling. And they tend to be either home-made from DH MTBs or wildly illegal for road use, or both.
The most obvious ”fuzzy” when it comes to design are things like the Rawbike. As far as fit and position goes, it’s somewhere between a Cruiser and an old school moped. These CAN be pedaled, but not very efficiently. Some riders are content with putting in the token effort to keep the motor going. Others modify them to use a throttle.
Overall, I’m honestly not that troubled by the legal definition. If it weighs like a bicycle and moves like a bicycle, let it move with the bicycles.
A technically illegal DIY bike that’s ridden sensibly would trouble me less than a stock ebike with the front brake disassembled.