We really shouldn't play (too) defensive. I still have ptsd from the first game against them. Most disgraceful tactical setup I have seen from us. Would rather see us "try" and lose 5-0.
Generally you would think stacking the midfield with Nico, Gavi, Busquets and Frenkie with Dembele as an outlet upfront shouldn't be torn apart easily, but it's hard to trust our defense.
We just don't have any variation or balance in our squad profiles, or it would be easier to make a defensive setup sometimes. There is a ton of the same profiles and no real variation. A ton of inside wingers, a ton of possession midfielders who don't defend, no actual strikers, etc,
Looking back, it would have been better if we kept the bunch of squad player guys we let go. We aren't making signings for a while anyway and we are still over the salary cap with all our losses moved to this year. Perhaps the various Ilaix/Trincao/Manaj/Konrad would have offered us some different solutions and profiles to play even if they weren't up to par. You look at our squad and it's really hard to set it up differently rather than boring possession systems and that gets fucked against good teams.
With that being said, we will be overrun in midfield if we try to play our usual possession game. Betis was outplaying us for a good part of the game in midfield and obviously Bayern's quality and physicality is a level above.
If I was Xavi, I look to stack the midfield in a 4-5-1 type system so we aren't easy to bypass and to stop the ball getting to their forward line.