Half my gear (usually old craigslist cheap finds) wasn't quick hitch compatible. My welder & plasma cutter quickly remedied that. Sooo worth it to not have to get off the tractor to hitch up.
The day I picked up my tractor, rotary cutter & back blade from the dealer I watched them fight for 10 minutes to get the rotary hitched up. I didn't take it off until my quick hitch came in. Never spent half as long as the dealer did hitching up anything with my quick hitch.
Most new gear is quick hitch compatible. Its usually old stuff you have to worry about.