I am with you on this. Whilst I do TTs I feel that doing B and C races where I am in the outside world handling wind and lumps etc. Helps prepare me for the various courses I will hit. I do a bit on the track and there is no substitute for getting used to that close riding and chasing a wheel or an attack. Must be even more important for road racing.
I do keep reading about people or seeing advice, that says - train inside, then do a big race. Frankly I don’t know how they can do that.
However there is a limit. I feel I am missing some of the structure of TR sessions racing too often in a week. of course there is a periodisation piece here…