No.
90 minutes seems a tad bit unbelievable with the app. I've been on a couple of busy ships on Carnival and maybe 10 minute wait? 90 minutes is a bit exaggerated.
I thought it was extremely easy and much more efficient to book your time on the app then your phone buzzes when table is ready. Similar to many restaurants on land. I liked it much better than standing in a line with coughing grouchy people.
It appears you don't like using your phone onboard. A lot of us do and prefer the app rather than paper.
The 2 top tables on every cruise ship I have been on (Carnival, MSC, Royal, Celebrity, Norwegian) in the MDR all are too close. We don't like it at all as we prefer to be loners and antisocial when we eat. Good luck in finding an out of the way 2 top. Only place you might is the back of the buffet or your room.