I think you’re missing the point, which is (to me) that DxO gives me worse macOS compatibility than comparable products. (Non-subscription at least; I have no idea what Adobe is doing these days.)
If I’m not mistaken, when I bought PL1 DxO had the same support as C1. Since PL4 that’s no longer the case. C1 20 and 21 both supported High Sierra, and I suspect 22 will support Mojave (since they haven’t dropped two OS versions on the past). Exposure X7 supports High Sierra and is the most impressive of this lot: X6 also supported High Sierra, and X5 had support all the way back to Yosemite if I’m not mistaken, and this with something like 8 employees that provide far better support than I’ve experienced with DxO. DxO seems to drop one macOS version with each release as a matter of routine.
Of course there’s a limit to how many releases is feasible to support. I’m quite happy with Apple providing OS support for 8 year old hardware and Exposure’s flexible approach to macOS support, but all DxO is giving me is another reason to use other products since I have no other need for new hardware right now.
I like PhotoLab, but I’ve been using it less over the last year because of your policies: poor macOS support, no real backwards compatibility of rendering with version handling of dop files, loss of the license for a previous version at upgrade, and the idiotic (sorry) need to contact support when I want to move my current license to another computer and their questioning of it; moving an old version is out of the question since I no longer have a licence. By the time other products eventually force me into new hardware I will probably have no reason (and no upgrade path) to return to PhotoLab.
That’s my experience.