This is what hurt me at the end of last year. The assumption that doing a lot of volume indoors would be adequate. I found out the guys who were doing 1500-3000m of climbing per weekend were a whole lot better equipped to tackle the mountains that I was.
Oh well, my original point above was that the intensity of the TR hard days is great, but still much more is needed (both in volume and number of intervals) to resume levels previously seen by continuous outdoor riding.