It is a listed building. What passengers want is of no importance, though I would suggest quite a lot of passengers want to stay dry when waiting for a train.
there is a debate to be had regarding form over function on the railway. a lot of cash does get spent on aesthetics and imaging and as pointed out does it help the trains run on time. if you look at how much is spent on retaining heritage features and the massive costs associated with maintaining the Victorian fabric of the railway an argument could be made that going to basic structures is more cost effective. For me losing the last vestiges or grandeur would reduce the railways in the eyes of the travelling public and we would end up with a pretty bland network.
Severe weather? just had a quick check on the Met Office site and the maximum wind gust recorded over the last 24hrs was about 20mph, hardly a hurricane. Considering Storm Brendan is expected to deliver 75mph gusts soon they better get it fixed pronto!