You are absolutely right.
It's not only why it doesn't grow it's why it drives Mechwarrior fans away from this game... the "community" stinks, the attitude and rudeness has driven hundreds of players away from this game over the years, it's been remarked upon on other forums for years i.e. "Nice game, toxic community".. a clique of woke nerds have dominated and ruined the game, criticise their established rule or make a suggestion to improve their terrible decision making and they come swooping down on you together like a pack of vultures.. (and cancel you of course).
MWLL is not a better game than it was say 8 years ago, it's worse and they've made it worse, their "improvements" over the years have been massive downgrades.
They've nerfed and maxxed the assets that suit only them to remove all element of strategy and tactics in a game that might have resulted in them dying more than is acceptable to them and to max the assets that they can exploit - meaning the game is now reduced to hit box targetting and skill nerding, it's no longer Mechwarrior it's no better than going into a 90s gaming arcade and using a light gun, Any tactics or strategies that might have inflicted on their personal skills in the past and leveled the playing field a little are immediately nerfed, and the nonsense excuses they come up with for their implementations are ridiculous.
Like you correctly put... the arrogance of those who are not the actual developers of MWLL but the custodians of it and who have done a pretty bad job of that is astounding.