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I often find the most technical bits are transitioning from downhill to uphill, hence big gear changes. Maybe i’m just not looking agead enough but I personally find having to think about an FD more of a hinderance than a help.
chiroshi-
if you have a wide 2x system you can easily avoid shifting the big ring constantly on singletrack. especially with di2. i ride singletrack all the time with 50/34 x 11-40. singletrack i'm basically always in the small ring. 34 x 11 is plenty big on tight/tech stuff. in any case di2 fd are so good that you can shift it really most any time without a hassle.
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On rollers I quite often just swap the front ring. Big ring to keep chain tighter and be able to add a little power while mostly coasting descents and then dump into small for next climb. If it's extended climbing or descending that's where it'll stay in one front ring and I'll bother changing the RD.
When you only have 1x and you have rollers like this you're actually waiting longer for appropriate gears to be available whereas I get to go back to concentrating on other stuff instead of waiting for the chain to fly up or down the cassette.
zmjones_
hippy
Remotely technical fast: big ring
Remotely technical slow: little ring
HTH