Probably because I have no respect or love for the T20 stuff, and think it is beneath him.
Any enforced rest for him should be a good thing.
Do you think he should be England captain?
Honestly, no. Its not that I think he is doing a bad job - indeed, the feedback from his squad seems overwhelmingly positive - and I caveat my answer with an acceptance that there are precious few credible candidates in the squad. My issue is, we have an annoying habit of giving the job to our best batsman, often also one with physical frailties, and making them a less valuable player as a result (cf Mike Atherton, Michael Vaughan) - and I can see similar hapening with Root if he is not careful.
The problem is, that lack of options. In the squad at present, you have the definite nos (Cook, Stoneman, Vince, Stokes, Woakes, Ali, Broad) alongside the probable nos (Malan) leaving only two candidates - of whom one, Anderson, is equally as valuable as our sole world class bowler and the other, YJB, is our second best bat and keeper. The latter has always impressed with his reading of the game, but to do all three jobs would be close to suicide. So Root gets it.