I think the „my brain isn’t the same anymore“ sensation is pretty universal. Between addictive online media in our personal lives and AI at work, I think we’ve made mental effort largely optional. That must be a horrible thing. One of my favorite theories is the physical activity transition. In my grandparents‘ generation, physical movement became more optional as work shifted from manual labor to knowledge work or o…
I have another suggestion which doesn't contradict yours. When I was younger I used to get bored way more often. I had to wait regularly during a week (e.g. for a bus, friend, appointment) or even at work as a software dev (e.g. compilation which used to take more time). This was also the case when doing some physical activities which didn't require lot of thoughts. Back then, before mobile phones with internet acces…
I think a lot of people believe that, as long as they consume "high quality" or more intellectual content, the negative effects of constant consumption are mitigated, but I think that's false. It's less about the content and more about the structure and process. If you never give your brain moments to stop basic processing of wildly different inputs and to just critically examine them instead, you will suffer brain rot, even if the content you consume is "educational".