Hi Ted12,
one drawback I've noticed is their heavy fuel consumption compared to a four stroke mower.
I have a Victa Tornado from about circa 2010 with a Briggs and it only requires the lower part of the tank to be full of petrol for it to complete my small front lawn (20 m² approx) and nature strip out the front.
The way they scavenge air and fuel, necessitates sine unburnt fuel going out the exhaust. I've been told that 20% of the fuel supply goes out the exhaust unburnt.
The two strokes only really excel in extreme stuff and sloping ground where oil starvation doesn't affect them. They are generally more durable as long as they aren't straight fueled.
