The points you mentioned also make me worry. Unfortunately, I can only find tests with Sony cameras and so far none with a Canon R5, for example.
What also worries me about the WWL-C is that you could lose focus a bit. I'm currently jumping into the water and know that I only have the setup for wide-angle and ignore everything to do with macro. If you can change the lens now, you're quickly tempted to take a macro here and a wide-angle there... you might quickly lose sight of the essentials π