.......which are maintained by LH Technik according to schedules by Airbus, have so many more problems?
You answered your own question there.
The LHT guys in the ME are most certainly NOT upo to the standard of the LHT guys in Europe. I had the (dis)pleasure dealing with them pre-pandemic and while they were a lovely bunch of guys, I seem to recall the whole contract going into suspension when an audit found they failed just about every check on their business certifications for safety, security etc etc. Everyone in the home office (who placed the contract) was shocked, but nobody locally (who actually dealt with them) was surprised in the slightest.