I was on the same cruise as the OP and have the same general observations. This was our 9th Seabourn cruise and overall I found service at the same level as past pre-Covid cruises.
Our stewardess team was accommodating, efficient and extremely personable.
Staff at Earth & Ocean/Patio Grill, Patio Bar and the Sky Bar were for the most part exceptional.
Service in the other restaurants was variable, but for the most part friendly and competent.
I have never been a big fan of the food on board (repetitive, tepid in temperature and fairly bland), but that is very subjective, and I found no change from prior voyages
Internet is unbelievably bad. Much worse than before the free package was offered. Knowing I would need to work intermittently during the trip, I immediately signed up for the pay package. Even so, one day it took me sitting in the Square for about 45 minutes to review and approve some wire transfers that my team had submitted. In normal circumstances this would have taken 5 minutes. We were in port in Halifax at the time, not at sea or in some backwater. Big problem. The day in Quebec City with no TV or internet for most of the day was also unacceptable
Sorry for the OPs problem with lemons. I drink ice tea during the day and kept telling the Patio Bar, Sky Bar and Square - no lemon!