GN stations are woefully advertised in some cases. You can barely make out the signs or station entrances. Such small things to get right. TfL would put up a big roundel, light it up, a big sign and make locals aware a station exists. With such a transient population in many areas many don't even know about stations and lines.
Agreed.
Currently, GN is my road less travelled to avoid the crowds, but I also see the general struggles to get home from the City and West End from other people.
I really don't think it's an issue! Those trains are packed in the peaks.
Plus I don't think railways get much passing trade really-people don't exactly walk around and think 'oh look, a station. Perhaps I'll go and catch a train somewhere'!
Not as packed as the Piccadilly Line trains. I sometimes have to resort to using GN at times when the Piccadilly Line is so rammed with people that I have to let 3 trains pass by before I can get on.
And knowledge of alternative routes help immensely during times of disruption. My mother didn't even know the existence of New Southgate until I told her when the Piccadilly Line was part suspended, and she had to be at work in the West End in an hour. She got there with plenty of time to spare, which wouldn't have been possible if I wasn't a rail enthusiast.
However, I can see your point. Without more capacity and more frequent trains, the disadvantages could outweigh the advantages. I still don't see how TfL could vastly improve the GN line when the DfT sets service frequencies and Moorgate has a certain capacity. And bus routes to GN stations are less good than their tube stations.
So while ideally, I would love the load to be spread between the Piccadilly and GN lines, as a GN commuter, there are indeed lots of hurdles to overcome for that to happen.