Clemaux, there are others who know more about this than me but I believe you have listed a set of devices which can tolerate fairly low specification memory cards. I too have never had a problem with cards in phones and tablets but I have had problems with cards in HD camcorders. If the card is not fast enough then quickly there is a buffer overflow and the card will be rejected. As Gary has told you the F750 is effectively two HD camcorders trying to use the same card at the same time.
I can't remember if I have stated this before on this forum but I work in the computer components industry and can tell you that one of the biggest issues is memory compatibility. Without going into detail, when you have very high level integration in semiconductor manufacturing at a competitive price, you need to sell every chip you can, even those which are right on the margin in test. When a memory device is on the margin but so too is the device it is used in, there will be errors, ranging from immediate incompatibility to annoying occasional errors.
What Thinkware is doing by supplying their dashcams with a branded memory card is ensuring that they work 'out of the box'. However as I have definitely stated elsewhere, whilst I like the Thinkware product, I don't like their QA. I think they sell too many products with faults, including my own F750. If yours seems to be rejecting memory cards too easily then I'm prepared to accuse it of being one of those dashcams suffering from Thinkware's poor QA and maybe you should reject it.
Yes 128GB cards work in the F750. Based on one report a 200GB card might be accepted but possibly only 128GB of it will be used. Please do remember that like other such web forums, it is the mainly people who are having problems who post, because they want help. That gives the impression that everyone is having problems. But that is misleading. I use a 128GB sandisk in my F750 and it worked first time and has never thrown an error. There are plenty of other F750 owners who can give a similar report.