All winners since 2014 had those ingredients, except Barca in some aspects:
Technique:
Rm
Liverpool
Bayern
Physique:
Rm
Liverpool
Bayern
Mental strength:
All 3
Combative spirit (the opposite to choir boys):
All 3
3 ways of attacking (direct as the main weapon, then possession and headers)
All 3
And then you have a current Barca, who has only technique out of these aspects.
This is a simplified checklist for modern CL, World cup and Euros winners.
Germany in 2014 had all these skills.
France also, with Giroud as the no9 for headers and Mbappe for counters.
And again, then you have Barca and Spain who play a totally different sport, in an inferior way.
Current Barca is not the best representation of Barca. Even the technique is shit because they're all dinosaurs.
I would take 2015 Barca over all any of those teams you've mentioned. 2011 and 2009 Barca too.
How about Germany in 2018? Group stage exit?
How about Bayern getting destroyed in 14, 15, and 19.
How about RM back to back R of 16 exits.
How about Liverpool losing Europa league final to a Spanish team in 2017.
You can't take the best RM, Bayern, Pool and compare it to the worst Barca. Compare it to the best Barca teams and we dispose of them with the exception of 16/17 RM and 12/13 Bayern, who'd be a good match.
Like always, you have good points but resort to the most convenient comparisons to exaggerate. Everyone knows we need to be more physical, press more, and develop more ways of scoring for the modern game. That doesn't mean that Barca's strongest teams weren't a work of art in their own right.