All the OH you mentioned + Populini are very young, they'll have time to improve in defense/reception, you don't improve in these skills in just one/two years. Sylla improved a lot in that and now she's fundamental for Conegliano. The only problem is that these girls need to play full time in A1 as much as possible, italian league is the best league in the world and italian teams and playing very well in CL, if these girls will be given enough opportunities to play at high level they'll learn quickly, we saw that in Conegliano with Fhar, Gennari, Omoruy. You can't judge a player perspective when she's 18-20, we just need not to bench them and give them enough time to play, unlike is was done in the past.
I'm not questioning a fact that generally almost all young players improve under friendly circumstances, but I don't think Sylla, Pietrini or Omoruyi will ever improve to the level of all-round OH, and this is what I was referring to. Italy has a strong group of talented offensive OHs (Sylla, Pietrini, Omoruyi, Gardini from Club Italia), and I don't think Populini in juniors was really an all-round OH neither. On the other hand, there's only Cate Bosetti and maybe Perinelli (and none of them is really 'young') to fill a spot of an all-round OH, although both have had serious injuries in the past (Cate) or right now (Perinelli). What's the alternative here?
So yeah, both Sylla and Pietrini have improved their reception a lot already, and maybe Omoruyi will do so as well, but to pair them together, your reception will always be more or less shaky. That doesn't mean you can't win big trophies with a shaky reception (especially with a great libero, and Italy has plenty of candidates for this spot), but with Egonu you don't really need to pack your lineup with offensive OHs, so that's why I consider this as a question mark for a future for Italy. Although - let's be precise - it is kinda obvious that probably no other NT has so talented and experienced already group of players that will be able to play in Paris in 2024. Basically, excluding injuries, only De Gennaro is a question mark age-wise if she's able to play in the next Olympics, not to mention that Italy is already one of 3-4 main contenders for a title this year.