>> Here's the thing - the time limits haven't ever been aggregated, so that behavior isn't any different than before.
Really? FS never aggregated time use in the first place? For a service touted from the beginning for its ability to apply the same settings across multiple devices, this sounds less like a clarification than an admission of both deceptive communication and clueless design. What is the point of a feature that limits time use if the child can simply hop to another device and the clock resets? How dumb is that? It's no wonder we all assumed time use was aggregated -- the whole feature would be absurd without it!
I hope you folks manage to get all this straightened out with Windows 10. I've never seen such an unmitigated disaster of an "upgrade." Sorry to be so blunt, but you need to know how it feels on the customer side.
--Bob