The placebo effect is also a very real effect ;).
I don’t doubt that different components (especially wheels, tires, handlebars) can make a huge difference. Regarding the frame only I highly doubt that anyone feels the difference between these models if there are no stickers on it. Even uphill I doubt you can feel a 100-200g difference.
But no judgement here. I love bike tech the same way like a lot of people here. I also like to choose the best things available within my budget and love saving a few grams wherever I can (recently - saddle bag and tools). It’s a fun part of the hobby. But I’m aware there is no real significant performance gain in that. If it’s about performance there are way more low hanging fruits than high end bike tech (sleep, nutrition, training).