Different people learn different ways. Some people can never crack a book and hit 1500. Other people need to read a dozen books to hit 1500. Someone else needs to read an entiely different set of books to hit 1500. So what? They all got to the same place. For some it was easier than others. That's the way it is with any skill.
Sick of Fast bullies in Blitz
Practicing faster, good moves can help you manage your time better. You don't have to compromise entirely on quality, but developing an ability to spot "good enough" moves quickly can help you avoid severe time deficits.
So you are saying the approach to games is in many cases to just concede and give up on what I feel is a potentially good move and resort to an inferior one, just for the sake of time? If I feel there clearly should be a way to punish a bad move and can't find it immediately, I should simply just play something I am fully aware is totally losing?
It is just too tempting to find ways to improve my position, rather than resorting to something clearly inferior that I know to be inferior.
This is part of what makes blitz so challenging - the clock is always ticking down, down, down ...
If you find yourself burning too much clock trying to "figure it out", it's often a sign that you're making things more complicated than they need to be, often by calculating too far ahead.
Most of the time, I calculate only 2 or 3 moves ahead, at most. Any more than that is usually unnecessary ...
You will stop losing to people who "don't study chess" when you climb to a rating only achievable by studying chess. But in all honesty I think you're being harsh with the term beginner. I'd class 1300 as midway into intermediate.
And that is my chess failure. I seem to have read that book in vain as it never brought me the level only achievable by reading that book. Others can simply reach that level without that book, not necessarily knowing the concepts from that book.
You already mentioned 50 year olds regularly losing to 8-year olds with no study time. My granddad was an example of that. But he had only read the first volume of that book, which didn't go deep into tactics. I knew only rules and had played Battle Chess, the Dos game back in the 90's and beat all his knowledge from that first volume of that book. So much for his pencil and lines and notes all throughout that book.