The reason we have to think of the premiership years is because that's the question
You can't, not incorporate what went before because of the feats achieved prior were all the more standout.
Pep's Man City are great on the eye to watch however I'd put their 100 point last season down to the fact that they had no serious competition - Man Utd where struggling through the Mourinho last phase, Wenger's Arsenal where on their last lap downward spiral, Conte's Chelsea where facing the player tantrums and we where waiting for Klopp's layaway's!
Would last season's Man City be able to face a 42 game domestic league season, along with FA, League and European Competitions, travelling in much slower, lesser quality transport to much more inhospitable places? I don't think so!
Then you have Wenger's Invincibles and The Fergie years and Mourinho's infrequent 2 to 3 year stints at Chelsea...none in my mind would have ever been able to cope with the demands of what Liverpool achieved.
Liverpool achieved a Domestic League and European Cup Double twice in 1977 and 1984 at a time technology and travel was horrible. It took far longer to get anywhere or get information...there was no internet, no sky TV to be able to see in glorious 4k what the next opponent was doing. All information about the next opponent was via our scouts.
If Liverpool did the same double this year it would be great but it wouldn't be anywhere near as an achievement against 1977 and 1984.