So I've worked for a game company where part of my job involved gathering feedback from players. The most infuriating thing in the world was someone saying "This mechanic sucks", asking them what SPECIFICALLY about it sucks and how they'd like it changed, and getting something along the lines of "lol idk but it sucks, fix it." I've seen that all over reddit, steam, this forum. "The game is too Divinity, not D&D." - "Okay, how exactly and what should they change?" - "IDK but it's not D&D, how dare Larian not make it D&D." My blood is boiling just reading this and recalling how frustrating it was to deal with when it was my job.
This is a pretty good resource on giving more specific and helpful feedback.
This is another great link with some example questions. Narrowing down the feedback as much as possible is very helpful, and personally I loved it when players gave suggestions as to how to change it. I.E "This companion is boring." = inadequate feedback, not very actionable. "This companion doesn't get enough dialogue interactions to engage me and it takes a long time to get to their backstory reveal, more interactions plox." = better feedback, actionable, tells you specifically why the character seems boring and a suggestion to change it.
A good way of doing this is whenever the game makes you feel something, especially frustration or confusion, ask why it makes you feel that way. Is the boss fight frustrating because there's too many enemies or they have too much HP? Is the tooltip confusing because it doesn't show the math or it's too short? Also, this is just personal experience, but don't be worried about getting too wordy, I loved it when I got a big essay full of indepth feedback, it really shows how much people love the game.
The more detailed, specific, and actionable the feedback we can give, the better we can help Larian make the game better.