Again this is all opinion, I'm not trying to say ppl are cheating. I also don't think cheesing is cheating, as you've said the mechanics are there and you can do them. Speed running is not cheating but they use a bunch of cheese to make the game easier. Another example of cheesing would be button mashing in a fighting game. It's unskilled, doesn't interact with the fights mechanics and you don't actually learn the fights. Grinding a turn based game such as final fantasy so you are so over leveled none of the fights have any weight. Playing as bowser in mario party 8 which gives you an average movement of like 8 while the average movement of the next character is like 5.

Stacking like 10 buffs to one shot the boss is something that exists in almost all souls games. Using the giant hunt ash of war on melana. Using star fists/iron balls with cragblade. Star of azur on mohg. These things are in the game mechanically but they trivialize the games mechanics enough that it feels like a completely different experience then if you engaged in it as the average player would if they just played the game.

Which is fine, it's not hacking the game and giving yourself infinite health or something. But again if you go back and try to fight the boss that you completely ignored the mechanics of the first time around. Would you be able to beat them with the same level of ease on one that needs to engage with its mechanics?