I sailed on the NS February of 2019 and the sister ship Rotterdam for a Baltic cruise last may. Unfortunately I can't comment on the tendering as we never ended up tendering with either ship.
I get picky with coffee and felt the only truly good coffee came from the Dutch Cafe, which is in a pretty central location and had a wonderful seating area. It was very convenient stop entering or exiting the ship. The food offered was great on the Baltic cruise, split pea soup wasn't appealing in the warm Carribean but after a rainy day in Norway it hit the spot. I did run to the buffet for coffee or tea on a few occasions I woke up before DC was open, certainly not terrible but not my first choice.
Activities across the lines certainly seem more limited. We are avid Happy Hour trivia attendees, and my husband really enjoyed the various musical acts at the Music Walk venues, so they had everything we needed. Neither of us are great at sitting through the large scale productions.
For both cruises we were in a balcony cabin and did the Have it All with the last one. Our last cruise was 14 days and I couldn't have imagined doing it in anything other than a balcony. Sailing through the Swedish archipelago happens early in the morning and it was amazing to sit on our balcony and watch it go by.
We will be trying Celebrity again for a Mediterranean itinerary this summer and plan to decide after that which line to sail on going forward.