Is RAW worth the storage for holiday photos

For photos you will edit, yes; for the rest it is a tax you pay forever. A practical middle ground is RAW plus JPEG on trips and JPEG only for everyday shots, then discarding the RAWs you never opened after a year.

Untagged exports assume sRGB and phones do not. Export with the profile embedded and edit on a display you have calibrated at least once. Perfect agreement is not achievable, consistent-enough is.

Yes: do the first step, skip the automation, and revisit in a month. Most of the value is in the first step, and most of the cost is in making it repeatable before you know it is right.