Agree with a large portion of this. Some of the companions seem heavily favored for content while others feel like they were done without fleshing it out.

Jahira and the Timeless Body Scroll its there there is conversation for it...but Nothing. This has so much you could enjoy out of it. Her quest is simply adding minsc to the party they should each have there own little quests for something special for each of them something to make them feel unique and important.

and then

Minthra and Halsin this basically ends in act 2 Halsin has a little unique thing but where Minthras DW option from act 1. It feels like she should have this as part of her paladin level up. There could be options to go back recruit Dror Ragslin to replace Karlach leaving recruit Neer to replace wyll and bring a Warlock of the Old One into the party as a replacement and 2 full story archs that could be explored.

Kagha and the shadow druids this could be a replacement for Jaheria in chapter 2 added a new story arch to letting moon rise fall to the shadows being shadow druids took over the grove they sent Kagha to Join the party I was hoping to see this implimented so hard in early access a way that you could bring Kagha into the party and some Snake Forms maybe seeing her pet snake join the party great opportunity to go full evil and feel like it gives you returns for what you lose.

what about Karlach

Act 3 theres are lots of interactiosn with her and also lazeal but they kinda got left behind with there storys only interesting with the main story line theres no special extra things to do no side options your kinda stream lined just into the main story it would be better if they had there own thing to do.

Gale
I know some people love him by far hes the companion I probably hate the most but it feels like if you dont origin character him he just is lack luster he doesnt bring enough to the table his story feels more sparse less involved than other characters I didnt even feel the urge to take him in the party half the time to explore his story cause there just was not enough there to entice me to bring him over a hirling in most cases

Act 1 Stuff that is unfinished
Hag coven - This is mentioned never explored.

Act 2 Stuff that is unfinished
Quest with Raven queen started nothing is done to continue this later.

Act 3 stuff wont even get into that a lot.

Hirelings

I dont even know what to say here they have back grounds you cant change there appearance currently you cant do pretty much anything with them accept custom build there class in some cases your stuck with a character that you wouldnt build or play with in a million years but you want that class or party setup your doing it in some cases you cant even get the race you want what if i wanted a party of all dragonborn drow or gith while I can do this I have to find people to join a game and help me design my party the way I want I also can only select 3 so I am forced to limit options I may want with classes or fire and rehire new hirlings this could be worked much better.

Biggest arguement here with the train of thought towards larion while I love the game - You wanted people to play the bad guys and to have that option but majority incentives to play the bad guy are taken away your punished at almost every turn for playing the evil character losing items losing companions losing help at the end of the game there is so much just missing for being evil. Great game but it feels unfinished and there was su much it feels like was left out in such an amazing game that while I love the game for 6 years it feels likes somethings got short changed even if it was stated a 100 times we didn't it feels like it was. I really hope patchs and DLC fixes this because if feel with patchs dlc and continued work this game could have a life span that goes on for quite some time.