I have a Crowder hive and absolutely hate having one here because no one else does (I inherited it from another New Mexico beekeeper, otherwise I owuld have started with a Hardison hive)..
If you have two colonies, though, you're not dependent on interchangability of equipment (which is only a problem in emergencies, anyway, which maybe you'll never experience). Obviously most beekeepers own more than one hive so that should be assumed. Being able to borrow or loan equipment to/with others, in the event of swarms is helpful of course.
My colony just swarmed and it's brood-less at the moment (there's a queen, she just hasn't started laying yet). I"m actually considering taking that opportunity to do major hive surgery - cutting all my combs down to fit into a Hardison hive I own. It's that much of a hassle for me, knowing multiple other beekeepers in town and wanting to be 'standardised' with them.
urban top bar hives in Oakland and Berkeley, CA...