Judging from my own experience, I believe that nowadays is much easier to find good teachers and material to practice and become really good. For example, I am middle aged and was a fan of Queensryche back in the '90s. Once I listened to them, I wanted to learn to play guitar so I got a number of music books, took some lessons from a guitar teacher, bought queensryche's books containing their transcribed songs and started practicing. It took me a lot of time to understand certain concepts and whenever I was stuck I would ring up the teacher or go through the books. Those were the times. No internet and no mp3s.
Now, besides having a good teacher, you can find a video on youtube explaining in multiple ways e.g the myxolydian scale, create your own studio using https://www.reaper.fm/, create your own backing tracks and practice your scales along with the tracks.
So my question is: Can someone become a much better musician nowadays with all this information available than years ago?