Is there a lot of marketing bullshit going around? Yes. That doesn't mean it's all the same or that everything is just bullshit. This is the classic oversimplification.
MP's, for instance, is the wrong metric to compare camera quality. A 8.3MP sensor can already capture 4K images. What you want are bigger sensors that can capture more light.
"108MP cameras" are just 12MP cameras where each pixel is sub-divided in 9 in order to lower noise through AI trickery.
And for SSD's, the 7 GB/s number is for peak throughput. What you "feel" when using it day to day is the latency. Get an Optane SSD and you'll feel the difference.
No, you won't "feel the difference" between higher throughput and lower throughput DRAM when browsing the web. It's not the bottleneck.
But it's enough to make a difference when you're pushing your DRAM to the max, be it in games, video editing or CAD. And it's the advances in DRAM that allowed us to see 16 core CPU's in a consumer platform - and even then, only just. Look how much L3 cache AMD needs to make it work, how much extra money you're paying (In the increase to the CPU's die size) to have a CPU that won't get bottlenecked by the DRAM.