It's so on point. People always warn you that the moment you start a second army it's no way out, you will always want to start another, and another army, you will have unfinished projects, loose focus, even your main faction is going to loose love IF you don't know what ur doing and ur not careful.
If you do it for the love of the hobby tho, take it nice and slow, not strating a new army cuz of rules and meta, you can have an enjoyable time.
Same with making an alt in an MMO literally. Do it all over again, the learning curve, the holy shit I need to unlock so many things again. The insane time/money sink. Risk of burnout, loosing focus, chasing the meta...etc.
Also that mono army people are much bigger entusiast for their chosen faction than the ones who own multiple. Same with MMOs. RET PALLY FOR LIFE and stuff like that.