I think we have a similar view that you need a solid defense for winning titles.
Fullbacks will have to support the wingers AND close down counter attacks by their pace.
Fullbacks are still defenders, don't worry. Pep isn't stupid.
I don't want to see our defense pants down in a naive hurray kind of football.
So yes, I wouldn't call the fullbacks more attacking but much more pacey, powerful and variable.
I also don't see the wingers cut inside permanently as the centre will be packed by double deckers anyway.
Pep will have to teach the lads to break up deep lying teams in various ways.