Same for me. Severance is probably the best show of last decade. The last time I had such an engrossing experience was while reading 1984.

My other two are:

- Shogun (The depiction of 1600s Japan is so real)

- Resident Alien (Funny and heartwarming to see an Alien getting accustomed to life on Earth dealing with complex human relationships with their flaws)

PS: I am sad to exclude Parks and Recreation which ran from 2009-2015 so probably considered outside of last decade.