The only reason why it looks like Real Betis has been undefeated on there home lately was because of the club they were playing against because when a team is much stronger than some other clubs that's coming on there home makes it almost impossible to loss on there home match but this time they would be facing a very highly and reputable club they have never meet for a very long time and Barcelona will use them as they have been using others on there home, so actually I do not see not any difficulty that awaits Barcelona because is an easy victory for them, however have we forgetting so early on there performance on Santiago Bernabeu?, so actually I think Real Betis are the ones that would have a difficult match today.
I will not assume that Barcelona will easily get 3 points, yes they are a big club that on paper has everything compared to Betis but football is always unpredictable as expected. In some previous matches Barcelona ended up disappointing. Real Betis just need to find a way to make Yamal not play effectively, Yamal is a key player for Barcelona to always win matches this season.
There are things that doesn't worth too much deliberation on and Barcelona performance is not only said in paper is something that's very true and I wasn't saying that base on like I have for Barcelona but I was saying it based on fact, so actually if you don't believe it to be true you can check what is already happening on there match now because currently Barcelona is wining Real Betis 1:0 and the only time Real Betis played like a home team was from first minutes to the fifth minutes they had much possession than Barcelona but after that moment Barcelona has conquered, so you can see why Real Betis home doesn't matter this time.