This is a good topic. My experience of Pentax is not current enough to comment. I recall when Sony first introduced the play memory apps (NEX-5N) I couldn't use it as I had a Blackberry!
I would say that the Fujifilm, Panasonic and Olympus apps are now quite good, you hit on the issue though, which is the connection method being unreliable.
In theory my Panasonic ZS200 and Fulifilm X-T30 supported LE Blutooth, but I could not get them connected consistently on Samsung or Apple hardware.
Also, the amount of information the apps collect is rather ridiculous (DJI seems to be the worst, although at least they have a safety reason), my personal phone does not have data and sometimes the Panasonic and Olympus apps complain.
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