To me, it’s not really an issue of whether or not some other solver fails you. I have a 10-year old set of Leica HD-B 2200’s, and that shitty Leica solver has worked in comps and on many hunts.
The point is how many of the same thing do you want to manage. Having an AB kestrel, and an AB phone solver, and AB in binos, and AB in a WMLRF is just simpler compared to AB in kestrel, and GB in binos, and Revic on phone, etc.
Edit to add: The AB CDMs/PDMs are also just simpler to G1/G7’s IME. Again, BC’s can work fine, but IME, the Doppler files are better.