Ya it was just an unexpected observation that I thought might be useful to somebody. WB with no Start10 - the WB Start Button Mouseover state works. WB with Start10 - the mouseover doesn't work. Personally makes me wonder if the mouseover problem is really WB, or perhaps Start10. Just threw it out there as a "fwiw".
Besides, there is possibly one other person around other than myself that actually likes to use the Win10 Start Menu occasionally or maybe not. I expect that there's no need to take a vote on it.