I seem to remember reading (maybe on road.cc?) the r7000 long cage RD was made to work with cassettes up to 40 or 42 a while back - think it was a pre-GRX article on how to gravelize Shimano's then current offering.
Yeah I made it work with a 11-40 cassette myself, all of them 5800-GS (+roadlink), 7000-GS and GRX810, I was just curious about this cassette as Shimano has no 11s offers between 11-34 and 11-40
I seem to remember reading (maybe on road.cc?) the r7000 long cage RD was made to work with cassettes up to 40 or 42 a while back - think it was a pre-GRX article on how to gravelize Shimano's then current offering.
EDIT: here's the write up https://road.cc/content/feature/how-get-ultra-low-gearing-gravel-bike-adventures-246424