I will agree with a few thing you said. He is his own designer and he should not feel the need to emulate he's predecessors in any way shape or form. I will agree that Céline had no strong brand identity before Phoebe.
I had no preconceived notions of Hedi coming in and designing clothes the same way Phoebe did. That's a disservice to Phoebe and Hedi. But I did hope that a smart man like Mr. Slimane would want to distance himself from what he did at Saint Laurent and bring something new to the table. Why would he want 2 brand
You are right, this is Season 1 and who knows in a year or two this aesthetic might mature and evolve into something new and interesting.
If we were to dissect this I'll present two case-studies: Karl Lagerfeld and Phoebe Philo. Two extremely well known designers whose influence on fashion is equal to or even greater than that or Hedi Slimane.
Karl Lagerfeld:
If you take a look at collections done by Karl at Chloe,
Fendi, and Chanel I think we can al agree that they look absolutely different from each other. There are elements that may be similar but on the whole they looked different. Now keep in mind that before Karl went to
Fendi,
Fendi had no RTW vision, he created the Fendi "look" from scratch. Now granted Chanel had a defined look but even he has moved it to a new place. He adapted himself to the brands he was designing for, still very Karl but very respectful of the house.
Phoebe Philo:
If you take a look at collections done by her at Chloe and Céline they look quite different. Again there may be similar elements, there was that easy, louche look to both, but there was such a difference Chloe felt a bit more girly whilst Céline was all woman. She grew up, and evolved yet maintained her identity.
Phoebe established a look for the house: Cool sportswear for WOMEN that had a French twist. (and in my opinion Michael Kors started that identity, it may not have been as cool as Philo but he put Céline on the map, he left the brand, he wasn't let go, the people at LVMH were quite happy with him. He probably could've stayed longer. But because it's Kors and not some "cool" designer very few people will admit it, but I digress). And there was definitley a way for Hedi to blend his downtown, rock, club kid scene with that cool french sportswear for women look that was going on at Céline. If Olivier Theyskens could clean up his grunge leanings and produce absolute beauty at Rochas and then Nina Ricci. if Martin Margiela could curb some of his dissecting and repurposing of clothing and produce the simple but look closer and see that there's more and absolutely luxurious at Hermes. Then a seasoned designer like Hedi should be able to evolve. But Hedi just seems to want to stay on the same gear.
And I really believe that he deserves more criticism for his casting. It is apprehensible and tone deaf. There was a Showstudio panel on this collection and they mentioned it at the end, and one of the panelists said "but that's who he's inspired by" and I thought that doesn't matter. The world has grown, more people have access to fashion and it's become so global. How dare he in a cast of 95 models only use 7 models of colour? That's a person who doesn't live in the real world.