Actually when they can compete and can give more performance there is something that can be expected from them to be able to destroy the dominance of Barcelona and Madrid and actually a few seasons ago they were able to change that and make the competition into the top 3, but after they won they slowly left and let alone a chance to destroy the 2 clubs above it because indeed they even stumbled in this season which made this like them after the champions returned to their factory settings and like other clubs in La Liga.
Spain's La Liga is mainly dominated by a few clubs, notably Real Madrid, Barcelona and Atletico Madrid. Other teams don't have good strikers and enough players due to the enough budget. A few days ago Barcelona already balanced team with buyern Munich polish styker Robert lewandoski. So undoubtedly Real Madrid and Barcelona two top ranked favourite team would play the final match.
In this case what you say is true, but before saying Barcelona are in strong competition with Madrid first they must solve their current problems because there are indeed many problems that they have to solve quickly such as registering their 5 new players, solving problems with De Jong, as well as finalizing Raphinha's finances with Leeds. When it is finished, they can be considered as strong competitors for the title.
As for Atletico, it will still be fifty-fifty in my opinion, depending on Griezman and Morata whether they can give a good performance there because otherwise they will probably be the same as last season.