I mostly play using the keyboard/mouse. Be sure to change the prompts to keyboard in the options under controller so the prompts are right!
At 3:23 in this review he says "at some point you're actually going to have to do some grinding"
https://www.youtube.com/watch?v=6bgVwW8qSFY
That guy is flat out wrong. The game certainly does get hard but you should get strong enough just doing the quests to overcome what shows up. You might have to pop back and pick up some components you missed but that doesn't involve grinding until pretty late game.
I am woundering, should I try to play without equipping my companions first and see whatever I need to do it or not? As I understand it is possible to by mistake override their equipments by mistake if you don't know what you are doing?
I wouldn't do the equipment tweek right off the bat. (In fact, I've never done that tweek.) Play the game for some hours first and, if it really bugs you that you can't tell each character exactly what to use, then use it. But keep in mind that you'll have a stable of 18+ characters by the end.
I'm saying it's a grinder because he says "rare components".
If components are rare, the only way to get them is…
There are rare, legendary, and even unique items in D:OS but I bet you saw lots of those without grinding! You fight plenty of monsters so you'll get plenty of rare drops.
Here's the cases where I've done some grinding:
1. Somebody missed a component for a weapon (first half of the game). This typically just means popping back to a previous area and killing 3 or 4 spawns, or maybe running by a bunch of spawns to let Mister Diggs do his thing.
2. Guild rewards. The guilds in the game have various achievements, some of which involve killing rare monsters. You'll bump into a lot of them just playing the game but sometimes one won't spawn when you go through the area the first time so you'll have to go through again. It's best to save the game right before going in, run past as many monsters as you can, and see if the target has spawned. If it hasn't, reload and try again. Definitely NOT a fun part of the game. You really don't have to max your guild levels out but you're going to need a few levels and, if you don't get lucky with spawns, you may have to do this a few times to be strong enough to get by the "Six Bases" portion of the game about three quarters of the way through the main story.
3. Somebody missed a weapon component (last half). These tend to happen more because you haven't gotten the "Daily" or "Weekly" rewards from a guild to open up special drops from monsters. Once you get the reward, though, you'll probably just need a quick trip to fight a half dozen or so spawns to get the drops - though I have had one component where I was stuck running through an area multiple times to try and get the right monsters to spawn. Missing some of these weapon ugrades isn't as big of a deal if you're just doing the main story. There's one quest from Nora that's really rough so you'll needs some pretty strong weapons to finish it but, since the "quest" is just a single battle, the only thing you'll miss out on is seeing Nora actually smile for once. The harder DLC will be downright killer without the strong weapons - though the easier ones are attainable.
4. Somebody wants Jeweled Steel. This is used to make weapons REALLY strong and the only way to get lots of it is to go through the Ancient Ruins. To get everyone's weapons maxxed out, you'll need to go through many times. This is definitely GRINDING. You'll also be making the final battle into a total pushover but you'll need these weapons to do the hardest DLC fights.
P.S. To even open the Ancient Ruins you have to defeat The Fallen. That is a
seriously difficult fight! I didn't have a chance in hell against that thing in my first play-through. In my second play-through I knew what was coming and planned accordingly - it was STILL horribly hard and I couldn't touch his brother Demigod later in the game. My third play-through went much better.
The Fallen kicking me around