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Lolo-
The gaps, Ed, think of the gaps!
10 speed 11-28;
11-12-13-14-15-17-19-21-24-2811 speed 11-40;
11-13-15-17-19-21-24-27-31-35-40.Gap remain the same between 15-24 on the 11 speed and those range are usually pretty where most people* ride on.
Also 11-27 on the 11 speed is almost identical to an 8 speed 11-28 (11-13-15-17-19-21-24-28).*except for Chalfie, who’s old as fuck.
edscoble
Biggest cassette possible, since you have to get a new derailleur anyway (105 R7000 GS, they can be found for less than asking price) with the 11 speed bar end shifter, I'd go for 11-40t* cassette.
*especially if your bike does not allow normal 11 speed cassette on the wheel, as the 11-34 and up required a spacer on a 11 speed freehubs body.