I always loved the simplicity of the two-strokes. No matter what happened, you could nearly always do a roadside repair and get home. I have ridden home with a broken gear cable, no throttle cable, no clutch, no problem.
I have just spent five days installing a Malossi cylinder and head in my GTS300. On a two-stroke PX it would have taken one hour!
Once when I seized my scooter rock solid, I stripped the head off at the side of the road, bashed the piston loose with a rock, put it together and rode home.
In forty years of riding two-strokes, I got stuck three times - once when the rear axle broke, once when the crankshaft broke, and once when the clutch started slipping and failed completely.
With modern scooters, your only resort is the mobile phone.
I would love to own a Vespa GS150 with a kitted PX engine. My pipe dream!