Each GMB Is It's Own Google Brand Account!?

[consultant]

The other day the topic of Google BRAND Accounts popped into my head - something I ran across but didn't prioritize many moons ago. So I decided to see what a brand account looked like on the admin side. When I bring up the brand account list, come to find it lists a brand account for each of my 16 business locations in GMB? Yet these 16 locations are all grouped under one "Google Business Account" I know organizing services in a simple way has not been Google's strong suit in past years.

Is it negligible to even worry about managing a "Google Brand Account" as opposed to just managing your GMB listings and posts and other Local SEO work. Or is it important to the point I should try to consolidate them into one brand account and if so, HOW?