The latest versions of DxO PhotoLab support CR3 files from the EOS R, EOS RP, Rebel SL3/250D, EOS M50, Powershot G7X Mark III, and Powershot G5X Mark II.

Support for CR3 files from the 90D, M6 Mark II, and M200 will be included in updates scheduled to be released by DxO Labs in December, 2019.

The latest versions of Adobe products that use ACR (LR, PS, etc.) support CR3 files.

Luminar/Skylum has been promising their customers for over a year that they are working on supporting CR3 files, though they still do not at this time.

On1 Photo Raw 2020 supports CR3 files. Capture One Pro (latest version) supports CR3 files except the recently released 90D, M6 Mark II, and M200 (which will presumably be added soon).

It's unrealistic to expect older versions of software that released before the CR3 format was even a thing to support it. Get your software up to date and you'll be able to process files from the newest cameras.

As to DPP 4 not providing the level of adjustments you are used to, I find that DPP 4 gives finer control than most other raw conversion software. It provides more detailed Canon lens profiles than most other applications. It also uses demosaicing algorithms written by Canon, instead of algorithms reverse engineered by third parties such as Adobe and DxO.