Things have changed a lot over the last few years, I think. We—customers, travelers, expats, tourists now have more options. Not long ago, it was absolutely necessary to have a "real" local bank account if you stayed long-term, and it surely was very useful for tourists visiting regularly. But now, I would say 90% of the usual transactions an expat needs can be managed with Wise (or a similar provider), covering basically everything related to payments—and paying is what we do most of the time anyway. 😛
A Wise card connected to Apple Pay, Grab, etc., goes a long way. (Getting cash at an ATM, however, is another story; there will be fees.)
Only if you earn money in Thailand and receive THB would you really need a local bank account, I guess. (Sadly, Wise does not provide a local bank account number to receive Thai Baht.)
For genuine tourists, apps like Wise combined with a card should be absolutely sufficient.
Just wondering: Are there other countries in the region where it was/is possible to open a bank account as a tourist? I always thought this possibility was quite amazing.