Honestly, I don't think the TSU issue is as huge a deal that you are making it out to be. Could it be improved and streamlined? Yes, for sure. But the thousands of satisfied Globalists that have been using their 4+ TSUs every year, year after year without issue aren't the ones posting here I don't think. The only occasional post is about the anxiety of whether the TSU was applied correctly and rarely the worst situation being discussed above where the TSU was somehow screwed up completely.
It's not a complete mess, its just not perfect. I wouldn't trade Hyatt's TSU Globalist benefit for anything because its a great perk for continued loyalty.