Note that while this might not be a smooth UX, you can remove/disable Bixby via ...

Cu3PO42 on July 8, 2019 | parent | context | favorite | on: How to Remove Bixby from Samsung Phones

Note that while this might not be a smooth UX, you can remove/disable Bixby via ADB without root and install your favorite button remapped from the play store in a few minutes to remap single, double and long press.