Tbh I don't even think the selectors are paying the slightest attention to the batting, it's not their major worry unless they have a humongous tail as they have all too often recently, and probably will the next one too. I would be amazed if they're pondering any change at all to the top six in the near or even mid term future (with Stokes back) and want that batting order to go forward. They're worried about shortcomings against spin of course and Sibley needs some serious work on developing a scoring shot against spin, but these worries are a long way down the list and I would be surprised if even on the radar. Tbh it's far too late to do much about it anyway with India coming up this Winter. (Unless cancelled - a massive possibility even maybe probable).
The bowling is the major worry, more specifically their lack of preparation for abroad. Their fast medium seamers are perfectly suited to this country but not on hard flat wickets with a kookuburra where pace is the key. They started the summer with a plan, 'more a let's ignore the Windies in favour of the far bigger goal', namely the long term plan and the ashes in Australia, preparation of our true quicks, getting test match overs and experience under their belts was the original idea, rotate Broady and Jimmy and likewise with Mark and Jofra. As often happens their plan wasn't too well thought out, playing both Archer and Wood at the Ageas seemed a mistake, but they haven't played Wood since and Archer has been trundling in at 82-86 mph most of the time he's played, having a thoroughly disappointing summer. They needed their quicks bowling 3 or 4 over spurts, no more than 12 or 15 per day, but bowling at 90 plus and adding something the others couldn't not duplicating their pace but with an inferior model. Of course there's more than one string to their bow and they can operate at medium fast pace like Jimmy Anderson, but they're not picked for that and don't do it nearly as well. Wood tbf just hasn't even been picked after the first test of the summer, but Root should have rotated the two throughout no matter what, results now don't count for as much as the ashes - noone except statos take notice of dubious rankings which have so many variables and usually just reflect the percentage of home tests played. The World test championship is laughable and ridiculous in its unfairness. Just as Root insisted on playing Bess despite hardly being worth his place with the long term in mind so he had to prepare his quicker bowlers with the long term plan in mind.
On the spinning front, England haven't given up on Adil Rashid, possibly our best spinner, playing red ball and tests again in time for the Ashes, he's easily our best imo. He would have to operate as part of a five man attack but could be bowled selectively and a real weapon, he's also scored first class runs although only averages around 20 in tests so a useful late order contributor. The long term shoulder problems that do hampered his World Cup bowling seem to be sorted and the googly is coming out perfectly and he's far more consistent without as much dross.