you think the annoying factors come from the cheapness of your plate
Yes, I do. I'm not sure and haven't actually tried any other plates. But it would have been pretty easy to make my plate better. The holes for the attachment pins appear to have been punched. They are a little cone shaped and measurably out of round. The travel of the lower pin subassemblies would be much more precise if they had just been sized a little different (though I don't know if there happen to be commercially available sizes of square steel tubing that come closer to a telescoping type fit), or if they'd had a couple inserts scabbed on before assembly. Now that they're assembled onto that square tubing, which was then welded in place, they can't come off without destroying something. So, it wouldn't have been difficult to build better, but it'd be much more difficult to retrofit. In retrospect I would gladly have paid 50% more if these two fit issues were substantially fixed. I guess if I knew what exactly to ask for, I'd pay a machine shop $100 to fix these things -- but the things I can think of that would definitely fix it up nice would probably cost $200 to $500, based on my experience with sending jobs to shops. I mean, after the welded final assembly, the easy options are gone.
Picking on a couple other minor points, the hitch receiver, which was just sort of a nice feature they threw in, actually interferes with the bottom frame of my boom pole. I can get it on, but they collide and make the boom pole rock sideways just a little. I mean to take a right angle grinder to its top edge. And, this plate comes with a top link which is just a plate with holes stamped in the ends. On some attachments this top link hits the attachment. If it could have been bent, or even if they could just have located the holes near one edge instead of centered on the plate, this would be better. Where their top link joins their frame with their supplied pin, they had total control over all aspects of fit, but it's still very sloppy. The top link is a funny case because in a sense it shouldn't have one, as it doesn't have bottom "arms", and in any case it doesn't need to be adjustable because you've got the curl-dump motion.
Still, it wouldn't have taken much thought or extra effort or expense to clean these issues up. I don't know that it's worth replacing, but I'd have read more about it and spent a bit more if I had it to do over.