Striking a balance between all the major modalities at all times is making more and more sense. I can see focusing each training period on one specific modality but still do the others in a maintenance mode.

I spent the last 2 months focusing solely on aerobic gains and learned the hard way in a group ride yesterday that I've lost my lactate threshhold and ability to go deeply anearobic that I had before I started this training cycle.

So, I think my offseason plan is to continue putting in the same amount of overall riding time to ensure some aerobic fitness, but to also include 1-2x per week of short, medium and long intervals at the start. With only 4-5hrs/wek, I'm not doing a large overall volume anyway, so think I can safely add in some intensity with this approach. My longest race next summer will be 2hrs, so I don't think the opportunity cost of missing some additional minutes at L2 will make much difference.