I would say that it is generally a consensus in the entertainment industry that international touring shows do not usually match the standard of the originals for the following reasons. Limitations on Casting/Performers caused by the travel, lower profile and status of touring shows, which also limits the appeal to the best directors, choreographers etc. Set Design and Construction are limited by the need to be made flat packable for transport between venues. The variety of lay outs in different theatres is a negative against creating the staging and audio for a specific theatre and its acoustics etc. etc.
Perhaps the shows you saw at the Rajadalai were the exceptions that prove the rule but I doubt it. And no I didn't see those shows either in Bangkok or anywhere else. Not my idea of an evening out.
While I am sure that expats attended these shows the contention that the availability of touring versions of such shows will attract middle management to relocate to another country is laughable. Although you state that Singapore and Hong Kong have invested heavily in theatres and travelling shows for just such specific purpose.
I can imagine the conversation now:
Him "Darling my company want to relocate me to Hong Kong"
Her "Do we really have to go?"
Him "It will be great, if we go we can get tickets for The Lion King"
Her "In that case let's pack our bags now!"