@carlyai @Everyman @Moonlover and for anyone else who sees/agrees with the point here, FWIW, I sent an email to BKK Bank mobile banking division yesterday - same group that weighs in on customer App complaints/comments on Google Play Store.
Not a bitchy moaning email, rather, asked them directly and succinctly what their suggestion is for married people, families, joint accounts, etc, who, until April this year, were able to operate independently of each other day to day pulling from the same source bank account(s) via the App - transfers, top ups, QR payments, etc.
After being conditioned to that convenience and independence, this latest security move is a significant, and seemingly careless, insular step backward. Moreover, when a reasonable alternative that preserves the underlying intent of the security directive, appears to be quite feasible - register and manage authorized devices, like Netflix, cell phone service providers, and a host of other subscription and/or controlled access Apps and websites do. Again, there's already a sub-section on BKK Bank's App for it. After this kicked off, I used it to clean up stray devices on my account - old phones, tablets, etc.
I'm not a computer nerd by any means, so I'm happy to be corrected by anyone who is. However this feels completely doable, but likely requires a dull uproar from the customer base to get attention, and potential action.
Wife is drafting a summary and will chuck it at Bangkok Bank/BoT, et al, on Thai language social media to (possibly) get some traction among others who've been handicapped by this move, but feel they're in a minority without recourse.
Will update here if anything comes of it. If anyone here agrees and would like to weigh in themselves and/or their Thai spouse/partner, on whatever social media platform(s) the wife leverages, let me know and I'll post a link here or via PM.