Because you shouldn't have to memorize what to do to be successful in a bunch of random scenarios in order to not lose instantly to something. That's not skill or strategy, that's just tedious and not fun.
They could easily design the gameplay to remove a bunch of these skillless scenarios and make it a lot more fun and focused on strategy and skill. That's how it's their fault for making a ****ty game.
Oh and btw my critiques have nothing to do with the actual game loss. That isn't 'forgot to scout and macro', that was just me being careless at that point in the game. I left my base completely undefended to finish off his because I wanted to end it already and didn't think he would be able to finish my bases. Also, like I said I thought I sent drones out to make hatcheries, but I guess not. One stupid little mishap and I lose a game that I most obviously deserved to win.
Failing to build hatcheries when you have the opportunity and need them is not one stupid little mishap. It's failing to keep up in one of the three fundamental elements of RTS: economy, army and tech. Blame it on not paying attention or being careless as much as you want, that is how you lose. You haven't won until the other guy GG's and leaves.
Those skill-less and tedious strategies are what keeps a strategy game from being "30 minutes no rush plz" turtlefests.
Imagine, if there was no opportunity for cheesy rushes or all-ins, what would you be doing during the first 12 minutes of the game? Babysitting your Hatcheries and massing a gazillion Hydralisks?
I know if I were completely secure for the first 8 minutes of the game, I would fast expand every single match. Probably followed by forge, cannons and direct tech to Carriers and HT.
Scouting and being prepared for cheese IS strategy. Who ever decided that only massing huge armies and building the right counter are strategy?
Go for gate->core->gate for a tech advantage? Fine, but you'll be more susceptible to gate->gate openings or similar. Scout appropriately and if your build is incapable of adjusting, you've got a bad build on your hands.
Keep all workers on minerals at all times for higher income? Fine, but you won't find that proxy 2rax outside your base if you do.
That aside, I think you're exaggerating how bad cheese is. I'm only in 9th Silver (soon to be gold, because this stuff is just easy), and I could probably draw you up a flowchart for scouting that eliminates 90% of all cheeses.
Scout own base quickly at 9, send to enemy base. Make sure it passes by common proxy locations. Scout around own base and ramp again at 12 or earlier if you've got the multitasking for it. Done. You have now eliminated any common cheese build. Anything else can be derived from your scouting information.
Zerg with a ton of speedlings, evo chamber and lair? Most probably a nydus rush. Protoss with 1 gate, core and no army to speak of? Probably proxy voids. Etc.
Doesn't mean that I don't occasionally fall for it, but it's not like you need to practice for two hours a day just to keep your anti-cheese up to scratch. If anything, memorizing the responses to cheese is FAR easier than playing a good macro game. Key is to just not get supplycapped and don't just run your scout around their base looking at the scenery.
Just yesterday I played PvP on Scrap Station. Knowing the wide ramp, I sent my 9Pylon scout around my base first before scouting their base. Caught a probe in a corner trying to build a pylon, killed it. Proceeded to go into the game with a 1gateway lead right from the start. It's not some sort of esoteric science.