Alas, it's that "what's gonna break" that gets my attention. I can find the MobileMe pieces okay, but I truly don't understand/appreciate all the inter/intra connect nuances that may be involved.
All too often, an update to a program/application has an effect on some other (distant) part of the system, that to me, is just not intuitive. Ergo, my tread is light.
OTOH, if to were not for folks like moi, no one would have ever created that adage about fools rushing in...
27" i7 iMac (10.13.6), iPhone Xs Max (12.1)
Those who can make you believe absurdities can make you commit atrocities. ~Voltaire