Please don’t take this too hard, but from your list I got the impression, you missed an important point …
WHY Digitone at all?
IMO since the beginning of it’s marketing it was made clear that the engineers tried to get some kind of squaring the circle by providing a FM-synthesizer, which could be operated by many of us easily, without the need to dive into the more or less scientific realms and the endless possibilities of the FM-synthesis.
A full blown FM synthesizer is often so overwhelming to many, who are not familiar with FM-synthesis that they tend to see it as witchcraft to create sounds and stay away from it at all. That is, what the enginieers at Elektron wanted to overcome in the first place and IMO they did a great job.
If we see the Digitone as is, which is not intended to be the “one to rule them all” machine - even a Moog One is not such a thing - and which also shall be at a moderate price target to bring FM synthesis to much more musicians, then IMO it’s a very balanced little box with an unusual fun factor for FM synths
I can only recommend what has been said above from others, if all those issues on your list are important to make you happy, get rid of the Digitone.