If it's the colors or the "styles", eg. voluminous skirts, they might resemble each other at a superficial level, but in terms of their shaping, detailing, making, etc., they're worlds apart. I have a waisted designer jacket and a vintage Bar jacket - they are completely different in the way they are constructed and sewn, even though both are similar at first glance. From afar, the effort put into the construction of the haute couture is visible, whereas the Jil Sander clothes were obviously cut from patterns and sewn on machines. The closeups reveal even more astonishing details of the making of the pieces - a combination of the designer's architectural achievements, the impeccable sewing or "couture" as well as the jaw-dropping intricacy of the details by the "petits mains". There're little black silk dresses by Zara, by Designers and there's haute couture. It could be a plain little black dress of a similar design, but the differences are there, and they're huge among the three.
This collection is not for me, but I can appreciate the couture genius, and Raf Simons is no slouch. The designs here leave no room for error. More frequently, I'd see an "haute couturier" send out a big silk satin gown with lots of flounces, glittering beads, long satin gloves with a large bow at the back that is crooked.....but because it looks and walks like a ball gown fit for a princess or a wedding, so it looks "haute couture". However, it is very crude work to me, and doesn't meet the expectations of the highest quality, or evoke the dream of the perfection that is "haute couture".
Everyone will like or dislike this collection, and that's fine. However, to be fair to Raf Simons and the hardworking and very accomplished staff at the Dior atelier, it is better to be clear about exactly what they do, and how it makes it "haute couture" or not "haute couture".