Because 1.e4 creates more open and tactical games where plans are more intuitive. In 1.d4 positions plans are less clear, especially for people in the 800-1500 range (like yourself!). For example, it might be hard for beginners to grasp concepts like "Minority attack on the queenside" (a plan typical in QG structures), or "improve all your pieces". For beginners, the plans in 1. e4 openings are much easier to understand. Common plans are "Attack the king" and stuff.
Also there's also the fact that is 1.e4 better. "Best by Test"- Bobby Fischer.
I’ve never really understood why beginners are usually recommended to play 1. e4 instead of 1. d4. The former exposes unknowledgeable players to countless tricks and traps, while the latter is considered somewhat easier to play and generally requires less memorization. The only reason I can think of for recommending 1. e4 is that it helps sharpen tactical awareness early on by having these new players get occasionally destroyed (for character development). Any thoughts?