Amateur pundits like big 'look at me' opinions. Which usually means deliberately having an opinion different to that of the selectors.
The Ben Foakes thing currently seems a easy way of looking like you really know your cricket.
To be fair you don't need to know much to see out of the 3 keepers who is the best.
The argument/debate/discussion on this forum is more to do with if you believe England should play the best keeper on the basis(in the sub continent especially) he will contribute more by taking more chances and also get runs.
As opposed to the better batsman who will miss chances behind the stumps standing up or back but make up for it with more runs with the bat(than the specialist).
That's a constant debate as people have different opinions of what keeper would be best for England.
I'd give the forum a lot more credit, there's no one I've read on here saying Bairstow or Butler is a better keeper than Foakes...absolutely no one.
It's more tactics. Those that think a batter/keeper is better can pat themselves on the back England currently think the same.
The fact Foakes is a more than decent batsman at FC level and the limited tests he has played makes it a closer argument than has been previously...like Matt Prior v Chris Read for example.