I only play Starcraft 2 regularly (plat top 25), but I see why it can be confusing for new players.
In SC2 for example at lower levels, basically macro > all. That is exactly what khanstruct says, the player who can gather more minerals and spends it, will win.
For a new player, it is not clear why he lost, so he can’t learn from it.
Examples:
If you die to zerglings while just finished your first few roaches roaches, you might think that roaches are bad vs zerglings, while in reality the dude you lost to just played better and more effective, or expanded much earlier, or built an additional hatchery to swarm you, or upgraded his lings. But as a beginner you dont see these, you only see that your roaches die VS his zerglings, so you don’t really learn anything.
Another example: When you die a lot to early aggression, you might be tempted to think that the answer is to build a lot of static defense, while actually the answer is to begin to produce your own army earlier, or spend less time supply blocked, or predict what the opponent will use to harass you, and build units that counter that. But you don’t learn these, you learn to build a lot of static defenses that are just somewhat effective and all they do is to delay your death.
Stuff like these. It is hard to tell for a new player why he lost, he will draw bad conclusions, and so on.
There are also some tactics that can be super annoying for a new player, like cheese tactics and all-ins (6pool, cannon rush, banshee rush, bunker rush, etc), that take some practice to detect or predict, and if you slip or react too late, you autolose.
It takes a while till the true face of an RTS shines, once both players have 120+ APM and a solid understanding of game units, mechanics and possible tactics. That is the point where it actually begins to become a strategy instead of the “higher APM, better macro, cheese wins” game.
So that is basically my opinion, I hope it wasn’t completely useless.