The seam bowling isn't really the problem though. It's easy to rattle off a bunch of seamers who might theoretically have been okay in Tests, but when all your fast bowlers and all your batsmen are averaging <32, taking punts changing the bowling isn't going to solve anything.
I totally disagree that they've been too cautious with the batting selections. They keep stridently seemingly to believe that the performances of the batsmen they're selecting aren't the best they can do and then swapping them out for similar standard players who perform similiarly. They've tried everything too - the best county performers (Burns, Pope, Sibley, etc), blokes who just look good (Crawley, Vince, etc), blokes who've done well in other formats (Roy, Hales, Buttler, etc) - all failed.
The problem isn't their selection, it's that their batsmen (both the ones they are selecting and the ones they aren't) aren't very good. It's not a very ***y problem to try and solve in our airchairs on CW, but I think it's true.