I think I'm contributing to this thread from a very different perspective to some.
I start from recognising that MZ in particular, led the world in 2-stroke technology before Ernst Degner's defection and passing secrets to Suzuki et al.
These folks look to have a lot of fun racing MZs
https://bmzrc.net/ (This is probably the modern equivalent of Bantam and Tiger Cub racing I watched at Snetterton in my youth. Good entry-level racing and long may it continue.)
Having actually owned and ridden a CZ175, I'm neither a fan nor enthusiast. It's just that from my perspective it wasn't a bad bike. It wasn't a great bike either.
They are a very simple design with minimal maintenance required. I had previously owned larger Brit bikes - Triumph Trophy 650, Bonneville 750.
The CZ wouldn't stand anything like as much hard use as the equivalent Japanese bike I would think. But treated with respect for its simplicity - i.e. not thrashed - it can be made to give good service. Bought mine secondhand in around 1980 and finally disposed of it in 1998.
I used to commute 8 miles into Exeter (and back!) on it all year round and made one epic trip from Devon to North Wales (best man at a mate's wedding) on to Warrington to visit friends and back to Devon - not exactly 'Ewan & Charley' but a good trip. No problems.
I have always approached motorcycling from a Zen based viewpoint - I certainly now have a Buddha-like body - with any bike ride being a good experience.
I guess the mileage of others does vary.
Ride on
Andy