apart from being a means to finalize strategy, friendly matches can also be a means for coaches to test the application of new formations and also to see how the quality of new players is, friendly matches are of course needed to be able to evaluate the team and apply it when the league match starts, I I think a lot of coaches might try experimenting at this point before actually finding the right formula later.
Apart from that, friendly matches during pre-season are also good business for the organizers so it can also benefit both teams. Trial of strategy, new players is an absolute thing, but many of us forget that it is also a profitable business.
For now the friendlies are on until the end of August, and if it's about Barcelona then I think we'll see another big game against Manchester City. There are still plenty of matches to look forward to, but they might not be that exciting if the opponents aren't worth it.