Seems perfectly sensible to me to take Jennings to Sri Lanka given he is our best opener against spin. No one would question taking a bowling attack for the conditions you will be playing in
That’s a viewpoint, another would be if you look back to the sides that were up the top or the best in the world their batting(and bowling) line ups stayed pretty much the same regardless of where they were touring, the backed the players to adapt.
You could also have the view we are no where near knowing are best batting line up, the horses for courses conditions might mean we stay not knowing for ages.
Sri Lanka are a poor test side, we should beat them without Jennings but with Sibley,Crawley,Burns.
I say we should beat them