Yes you're right, losing Pep Guardiola might make the league tougher for Manchester City next season, although Enzo Maresca want to follow Pep Guardiola coaching footsteps, but in my opinion it will be a very big challenge to match Pep Guardiola pattern. Enzo Maresca is luck to have a team full of talented players, i believe he can win trophies if he manage them well. Arsenal played a wonderful games this season but I'm concerned with their defensive tactics because i don't think that will work on their favour next season.
Arsenal, as i have said several times, in my humble opinion, are the strongest team in Europe at the moment.
Paris Saint-Germain only won on penalties, but honestly they were taking them.
They are two profoundly different teams, i see Paris Saint-Germain as water, fluid, adaptable.
While i see Arsenal as really rocky, very difficult to scratch.
I just believe if there is any changes Arteta will take correction before the start of the season. Next season is going to be another great season for Arsenal, they will make sure they do more than what they did last season.
Manchester City changed their new manager and I think their new coach need to take a while before he start giving their fans what they want, and I think before the players get use to the new coach pattern Arsenal will do the needful and and wake-up, let's see what Arteta will do.