The question should be whether Mikel Arteta has lost confidence in his strikers and has resorted to using wingers as a usual or the strikers on their own have lost form. I remember when Jesus Gabriel was in good form, he used him also for every match even when there was a striker like Nkeitah. Arteta just sticks to what works for him for a very long time.
Honestly, I find it quite strange that their scheme is 4-4-2 rather than 4-3-3 when until now Saka's role as a winger was much better than being kept as an attacking midfielder. In addition, they also have a midfield that is not very good although their individual skills cannot be doubted but in the end we can see their ball flow is not going very well in this match which makes them seem to lose motivation in attack even though they dominate the game.
Comprehensive improvements must be made now although it is undeniable that the reason for the players' senses and the tight schedule conditions made them lose the stability of their performance but for a big team with good expectations at the beginning of course this is not too good for Arsenal.