Of course it would; Christmas is a special time of year and the railways in nearly every country run for the purpose of uniting families and friend groups - as well as taking many people to work - rather than pure avarice or commercial interest. If you disagree, you will either need to show me that Christmas running makes loads of money for the railways that do open in, say, Italy, or explain why this specific form of British Railway Exceptionalism is justified. Yes, there are barriers to running the service here, but they are neither insurmountable nor amount to an objection in principle to running trains...for people to ride on...to go places they need to be.
Nobody said anything about importance.
Why are you so cross at people having an opinion? I'm allowed to have one, aren't I, just like you have yours. Do I have to explain that the stuff I post here is opinion and talk down to people here by prefacing everything as "Well, my opinion is..."?
"Why use the train when you can fly or drive" does not exactly promote the railway.