I would not recommend going all-in. but instead, slowly research the drivers and features available.
there are too many things that got broken especially last month when the “smooth” transition from DTH to Edge was supposed to happen.
We have several Matter drivers. no one knows if they work, since there are no devices on the market. Anyway, it’s a good sign as it’s a long-term investment in the platform.
A) If you have any groovy smart apps still installed, you will need to start removing those as groovy will cease by the end of this year. Some of the popular custom smart apps such as WebCoRE, the old MyQ, and others will cease so be sure to check for their alternative solutions with the new platform. You can add your devices but be aware there is a migration from groovy Device handlers to Edge Drivers so there may be a slight learning curve involved.
B) There is no need to reset your hub since you still have some devices connected.
c) There is no need to get a newer hub if you are using the v2 unless you want Thread.