The point of joining a group is that all parties need to compromise. Not an expert in the issue, but article seems to imply that Finland is the only one in 28 member states which is really unhappy.

If everyone else doesn't mind removing DST, sure, whatever. But what if there are 8 countries which really don't?

BTW, Finland can just start ignoring this rule. Nothing will happen. Despite popular opinion, the EU can't impose shit on it's members if one truly doesn't want it.

Then we'll find out during the process, and discuss what that means (which I suspect would mean "nothing changes", since changing things is harder than maintaining the status quo, and I think it's unlikely Finnland will care enough to want to be the only exception).