That wouldn't be much good as you'd then have exposed live conductors. Also a risk that the connectors drop out due to train movement. Perhaps they will have to put some kind of fairing over then, or daub them with anti-climb paint, or perhaps even move the cabling and piping. Whatever the solution, it a bit carp that the issue has been raised after entry into service. I actually think it's a non-issue and typical of the sort of thing that comes out of a desktop risk assessment. I can think of multiple ways of getting into the roof any any train in a station without much difficulty. But for sure someone is going to make someone else spend a lot of money mitigating said "problem".