You’re reading the room wrong.
It’s a personal issue and we’re playing with no proper defensive midfielder and a player who isn’t even good enough for his own position at right back. At this level you’ll pay a heavy price for that since the margins are so small, especially in the bigger games vs teams like Arsenal.
You talk of standards slipping last season but we won the league, an all time record accomplishment, and went out to Madrid in the CL on pens after outplaying them for 90 minutes. Standards had never ever been higher for a team seeking a 4th title in a row and following on from a treble.
That team that was out there today is no where near a title winning XI, no matter how hard they try or how much they want it - it’s top 4 at best. The only way this is fixed is with a returning Rodri, a competent back up being signed, a new top quality right back being in place and players like Dias shaking off their run of injuries.
What won’t solve it is buying several young defenders no one has ever heard of in the hope they turn out good in the future. We need proven quality and we need it now. The fact we’re signing the former in the current transfer window probably points to why we’re struggling - the recruitment hasn’t been good enough and it remains an issue.