I'm afraid Chelsea couldn't start the friendly matches well.

First a draw against Wrexham and now a huge defeat by Celtic, 4-1. Maresca is new around here of course but hopefully he manages to find the right system for the team soon.
Because there isn't a long time period left for the season to start officially. Pochettino was sacked for no reason and now they have to experience the same process again. Enzo Maresca will need to adapt to the team to make things better. The worst case scenario would be his not being able to meet the expectations at all. In that case, I presume that Boehly would regret sacking Pochettino while things were getting better actually.
Losing in friendly matches is not a big problem because after all, it would be dangerous if Enzo Maresca forced his players to play optimally because this would also be dangerous for injury. Therefore, I don't think it's a problem about Chelsea not getting good results in friendly matches because after all, friendly matches are just to get players or teams back to fitness.
Because for me, friendly matches are not about winning results, because with friendly matches at least the coach will have his own assessment for each player in his squad. Therefore, instead of aiming for victory just in friendly matches that have risks about injury, then I think it is enough to play appropriately and not to overpower.
The friendly match is actually a match intended to see the fitness and performance of the players and is also an opportunity for the coach to experiment with the strategy and framework of the main team he has formed, but in chelsea case I don't know whether we should judge the two negative results achieved by Chelsea as fair or bad result in their get current friendly match, because if we look at the negative results obtained by Manchester United, City, Liverpool and Arsenal in friendly matches, it is very natural because some of the players they have fielded are young players and reserves, but if we look at Chelsea next season it will be relying on young players, isn't there a worry that the negative results obtained now not difference with their performance next season?
Honestly, If looking at the young squad that Chelsea currently has, I hope that their will be able to develop well to be able to compete in the English league, but for next season it looks like we will not see Chelsea best performance yet.
From the start of next season to its end, I don't expect Enzo to have magic done in the Chelsea team. We will be seeing the same results, no difference in the team will be made at this time, if Chelsea likes let them sign young talented players to their squad. The impact will not be felt in the team unless Boyle begins to learn how to be patient with Chelsea's coach rather than be in a hurry to sack them. The sack of Pochettino was a mistake move taken, I believe he won't repeat the same mistake with Enzo, to sack him without coaching Chelsea to the agreed year of contract reached.