How to navigate form 8958 in a community property state

I live in TX. My Spouse operates a LLC, but keeps me in the dark about the financial aspects of it despite my repeated attempts to acquire this info. As a result, we file MFS. Been married for almost 4 years now and I'm just now finding out about IRS form 8958? We have no kids, we don't share bank accounts, I'm the only one on the loan for the house (spouse is listed as non-borrowing). We both take the standard deduction every year. Would I face a penalty for the past years of MFS? What even is the penalty? I know some people fill out form 8958 where each persons income is assigned to said person, but isn't that the same as filing MFS without the form? I've also read on here that some couples don't file this form with their separate returns at all and nothing has happened. Does this form serve a purpose if we're not claiming each other's stuff?