I've posted about this house rule before wherein my DM decided that upon levelling up we would add our Constitution modifier to the hitpoints gained.
This was due to our first session where we misread the player handbook and created our base HP using the Constitution modifier instead of the Constitution score. Our paladin took a critical hit from a kobold and, because of this mistake, almost died. Although we fixed our HP, the DM got paranoid and instigated this rule.
In my previous question, I stated that upon doing some calculations I believed that this rule would make the game very imbalanced in the future. The comments and likes seemed to agree with me so I decided to mention this problem to my group.
Unfortunately, the people I have spoken to so far seem very reluctant to change this. One of them is the DM who created the rule (now a member of the party) who claims that in our previous adventure in which he was DM, he actually had to nerf the final battle even with this house rule in place.
Now I don't know what to do. I want to play the game properly but if I bring it up to our new DM either it will change and I could be vilified or everyone might agree with the ones I spoke to and the game will be totally unbalanced and boring later down the line. What should I do?