While you can grind to an extent in Dark Souls games, I would say the route they've taken is to let you explore. So very often if you're stuck on a particular boss or area you could grind lower level enemies for souls to level although this is generally inefficient, or you could try looking around a different area you've not explored and potentially find an item that lets you upgrade your weapon, or a spell that greatly helps with the boss fight. This is subtly taught early on in the game when after leaving the tutorial zone there are multiple routes you can take, but you quickly come to realise that one is a lot easier than the others.

Note that this isn't as true with Sekiro, which has a lot more sections where you are forced to just learn a particular encounter. That's not necessarily a bad thing and in fact is part of the reason why many people find the combat a lot more satisfying once it clicks, but it's worth keeping in mind that it's a different kind of game and it probably shouldn't be approached with the same mindset.

As for the Dark Souls PC port, the original release (Prepare to die edition) was locked to 30fps. There was a mod that let you run it at 60fps, but it caused some slight gameplay issues (I believe you would go half the horizontal distance when jumping). That version is not available anymore - you can only purchase Remastered edition now, which runs at 60fps.