The built in mod support is kinda the scary part for me. It makes me worry that they could exercise too much control in the long-term. If it becomes the main point of distribution, then how is it different from how Minecraft Java vs Bedrock works? It would simply rely on trust, I think? Even if the option exists to do it another way, people will go with what is easiest. I kinda prefer letting sites pop up and handle it. Less of a worry over restrictions and monetization.
Everything else for me is mint though.