Before i dive deeper into the topic, i'll just say i enjoy watching ohdough and thiccfila, they are entertaining fellas. That being said, this whole "we just want to improve the game" is not what they are claiming it is.
Putting aside the valid criticism of HD2 having certain balance issues, and lack of meaningful progression, their version of "improving" the game at the end of the day translates to making the game easier so that they can stream and play the game without dying 10 times in a single run.
Ohdough during cyberstan update is on record saying "cyberstan being this difficult will drive a lot of people away, and that is not good for the game". If you take a look at ohdough's recent comments on dev AMA, and his community posts on youtube, he keeps framing challenge and difficulty as the opposite of fun. Thiccfila is on record a couple days ago saying "i will eventually just start playing warframe and never install HD2 again".
Even if you go and take a look at any of the their community posts on youtube related to any of these issues, it's just a bunch of warframe players in the comments that are saying they want to turn helldivers into warframe.
This is very clearly an effort that's being exerted to turn the game into what they like, and what HD2 is not, which is a game that you can play with 0 brain activity, like warframe.
At the end of the day, it is a good thing that helldivers and warframe are nothing alike, because this way everyone can enjoy what they like, but if you like power fantasy, this game is clearly not for you.