Well, obviously I strongly disagree. A party of four is extremely limiting for:
Having a well-balanced party where party roles (yes, those still exist and matter in 5e) are properly filled out
Having more intra-party interactions and banter
The joy and fun of managing two additional companions in terms of their character development and equipment
Make combat more interesting because I will have more to do during combat

For all these reasons, I will never play BG3 without a mod that increases party size to six. And I will even consider such a mod to be a required default for the game, so if the mod causes any problems or incompatibilities in the game I will blame Larian for them and consider any such issues to be Larian's fault and responsibility.