Because the areas of the team and individual players are just picked seemingly without thoughts of how they effect and work as a unit.
Play a slow defence including either Jags or Williams and you need pace up top to give a release/outlet to the pressure.
Don't play any pace up front/wide, then need tom NOT play the slow defensive players and have to go with Keane/Holgate for example
Realise that certain players cannot play inn the same team as each other without both being infinitely worse as a result. Gueye/Schneiderlin (actually any combination involving Schneiderlin nowadays), Rooney/Sigurdsson and any left sided player in the same 11 as Martina.
Just off the top of my head, Pickford, Holgate, Coleman/Kenny, Sigurdsson, Gueye are all good enough to put into the team in their proper best positions, then pick the players around who compliment them, and if you don't have any that do, go and f'ing buy them
Buy a proper decent/good left back and solid centre half who has decent pace and the entire team shape changes.
just going off players who've moved in the last 6 months or have been rumoured to be available, stick a back four together of Kenny/Coleman, Holgate/Keane, Sakho (i know) and Shaw, pickford in behind and that team has pace, can play a high line, can provide width and attacking support and doesn't force attacking players into defensive roles (or mean we have to play players like Lennon because they can run hard...)
Who knows maybe in that set up the likes of Sandro, Klassen, Lookman, Vlasic could then be actually played and may perform as you wouldn't be asking them to do parts of their game not suited to the player