Earlier quoted context omitted.
Look, a couple of hundred thousand people commute across the border on the island of Ireland and there's huge cultural issues around basically everything. The Republic of Ireland would never be in a different timezone to the UK as long as part of the UK is on the island of Ireland. It's just not going to happen.
That may be, but don’t call a neighboring time zone “friction”. I grew up next to Indiana, a state notorious for screwing up their time. (Scroll down to “History” and each decade for past 70 years.) https://en.wikipedia.org/wiki/Time_in_Indiana
Look, it's a cultural thing. The reason that we have peace on the island is due to constructive ambiguity. Half the population can pretend they're Irish, the other half can pretend they're British. Anything that makes that more difficult is not a runner.