Hello, I wanted to ask if a classic RPG (level up, farming, kill bosses) would count as an adventure game? obvious including its history and outcome of this
I'd say it's borderline. I've seen games that were set up as RPGs but still had mostly adventure game elements, but if the game is mainly RPG then... well, then it's an RPG.
One important feature of adventure games is that it's mostly deterministic. If you do the right thing, there will be an advancement. RPGs have a layer of randomness that usually have you lose a battle even if you technically did something wrong, and this isn't generally accepted by adventure gamers.
A way of integrating RPGs and adventure games would be giving more weight to items than stats. Like, have a boss battle that isn't winnable if you don't have a particular item which you acquire not through leveling up but through puzzle solving, having battles as a completely optional way of overcoming an obstacle (the Indiana Jones adventure games have this, for example - you can outsmart enemies, and if you fail you can still fight them or run away).