Well I didn’t expect to provoke such excitement.
My SL3 has generic / preliminary support in Lightroom / Adobe Camera RAW / Apple Photos, just using the coefficients provided by the DNG. Not perfect, but neither is the Leica firmware.
I’m touched by the faith that people show in the lens corrections that DXO offers. For example, they consider the Leica APO 35mm Summicron to be of comparable quality to the Sony Sonnar T* FE 35mm F2.8 ZA. It isn’t. (I have both.)
Anyway, they need to provide at least initial support for the SL3.