I'm not too concerned about RB. I'm not saying I'd turn down a new player like a Frimpong or a Geertruida but there is another way to look at it. Our team last season drastically needed a new, attacking full-back and the capture of Maatsen perfectly fits that profile of player. Moreno was flagging and on the wrong side of 30 and while Cash is no superstar we can all agree Konsa looked very comfortable at RB and gives us an intriguing balance when paired in that position with a marauding LB on the opposite side.
It works. A brand new attacking LB replaces Moreno, allows us to lean on Konsa at RB (as well as the capable Diego Carlos) and pave the way for Mings to return. We also have an emerging youngster in Nedeljkovic. I can confidently say I'd much rather replace Cash with Konsa (and likewise him with Carlos/Mings) than sign a new flashy RB and be stuck twiddling our thumbs if Digne got injured and we were left relying on a lacklustre Moreno or an out of position Pau/Mings.
With our financial constraints we might not have signed a new, sexy RB but we have managed to find and successfully sign a LB who, for all we know, is better than any RB we could have realistically signed this season. All while having capable, diverse options at CB/RB. If we were limited to signing only one fullback this summer, which I think is the case, I am over the moon with Maatsen.
Pending the return of Mings (some risk, yes, possibly covered by the emergence of Bogarde) our backline isn't as bad nor as neglected as some seem to think.