I cannot comment on the virtuosa but I have just returned from a trip on euriba Which is essentially a very similar ship and with the Northern Europe itinerary covering Hamburg b Belgium Rotterdam and lahavra
Please forgive the spellings. I am dictating this into my phone
Apparently one of the differences between the ships is the lounge at the back which is a paid entry lounge on the MSC virtuosa and a free entry lounge on the ship we were on
I would suggest that even with the extra seating that we enjoyed in the carousel lounge, at busy times in the evening, finding somewhere to sit with a bit of a challenge, especially on as my personal ideal evening is spent in a quiet bar with a little bit of music. Music just chatting to my travelling partner
Pretty much all of the public areas with seating tender to be rammed after the 6:00 p.m. dining but before the next
In my experience, however, when you do find somewhere to sit, it is usually in a very spacious area
Our cruise however was in November on the Northern Europe itinerary which very much meant that nobody was sitting out on deck, ever