Since I'm thinking of a new bike and actually do like the idea of going 1x (3T Strada), I'd like to share some thoughts on an experimental setup.
(reasoning is that I am not sure about 1x11 or 1x12 cassette, since I prefer a "straight block" for fast paced riding and am hearing some growing pains for the only 1x13 groupset on the market which actually does allow a feasible range)
* in case some of the product-managers/insiders already do have some MY2021/MY2022 Shimano insights regarding 1x12/13/14/?? please share :-)

So what do you think of below "setup"
Shifters: Shimano Di2 road, 1x11 speed --> these are supposed to just act as dumb switches, so should theoratically allow an infinite nr. of gears?
Rear-der: Shimano 1x12 MTB Di2 --> already proven to work with the road shifters
Cassette+hub: Rotor 13-speed --> this cassette uses the same cog-distance as 1x12 shimano, with just an additional cog afaik?

Since every rear-der. does have some additional range(low/high limiter screw), I can imagine the full "throw" (with low/high limits maxed out) could allow the width of a 13-spd cassette, so allowing one additional cog.

So basically from a mechanical p.o.v. everything is more or less existing for 1x13 Di2, right?
Then the bigges issue will be, does anyone have experience "hacking" the Di2 system, such that the derailleur will allow 13 gears?

What do you guys think of the above setup/feasibility?