I agree with your assumption that Barcelona is the best team in the world right now, but Barcelona is the best team from La Liga. If you talk about the best team in Europe it is Manchester City and this season Barcelona is not one of them.
There is no better team in La Liga this season than Barcelona. The two titles they have won this season are proof that your assumptions about them are very weak, but of course only about domestic competition. I even really doubt how you came to that conclusion, I think you just don't want to admit it.
Actually, I don't want to compare these two clubs, but it's just that these two clubs have advantages and strengths in their respective standings, such as Barcelona being the best in LaLiga and Manchester City being the best in the premier league.
But for the best club in Europe, I feel that right now it's just Manchester city because it has managed to get 3 trophies this season and getting the treble title is enough to prove that Europe has the best club at the moment, namely Manchester city.
I agree if someone says Barcelona is the best club in La Liga this season because they have just won two titles after being transformed due to failures several seasons ago. Comparing Barcelona to Manchester City is like comparing Ferrari to Lamborghini, both have their own advantages and disadvantages.
This season Barcelona lost success with Manchester City, Barcelona was only able to win two trophies while Manchester City won the treble winner. The Champions League is one of the most elite competitions in Europe, Manchester City managed to win the UCL trophy after a tiring struggle, I agree more with Manchester City being named the best club at the moment than with Barcelona.