I honestly think they ran out of development time because they were mucking around with setting up credit restrictions on APAC server transfers. And because they tied transfers to 7.4.1, which were needed asap, they rushed out the patch before it was 100%.
If they’d just left the credit limit alone on transfers, they could have opened them back in January & then spent all their dev time working on actual 7.4.1 features. And they could have pushed it another week or two if it still wasn’t polished.
I also have a theory as to why there was no public PTS & why we may not see one again. When they tested SV earlier last year, it was their current PTS. If you look at last years PTS use & development cycle, as soon as they closed the PTS, they opened up SV that week. Which tells me that the current SV was probably the PTS. Which is why they didn’t announce an opening date ahead of schedule because they didn’t know exactly when they were closing the PTS. And it’s why we will probably never have another public PTS again because it’s now the SV server.