What would happen on people that live in UTC+12:00 ? When your friend say “lets meet on Tuesday”, which Tuesday it is (because the day changes at noon)?

Given how +12 is at the front of the "date wave" currently they would probably take it to mean the Monday/Tuesday noon.

People will resist such majorly inconvenience changes unless the benefit of switching is clear for them. Forcing unpopular changes will guarantee people using unofficial timezone which cause even more confusion down the line.

Yeah fair. To me the benefit is clear, there is no good rhyme or reason to timezones as a totality, we should come up with a better system. A straightforward approach like using UTC offsets seems best.