Pretty simple to consider: Do you know enough to trade one of the worlds top tier instruments?
It is 98% you, OP, that is the issue, not the ES intraday. Many trade ES intraday with no issues. Those who can't figure it out are the ones who claim it is not them that is the problem, it is ES that makes it "impossible" to get an edge.
You simply don't know how ES intraday behaves in the various conditions that will occur intraday over a year or two. People often underestimate who they are against in ES or overestimate their abilities and skills.
Why would one think they are so "smart" they could learn how to trade a monster like ES in a few months or few quarters. Ego Check Time. You can't even get a good sampling of the situations and their exceptions in that time.
ES is the equivalent of THUNDERDOME.