This article makes the case for "dynamic" GBP vs the traditional static approach. It boils down to:

Everything is an engagement signal, and you want your GBP to "look alive" - steady stream of reviews, steady stream of replies to reviews, regular photo updates, regular posts, making sure all your info is always 100% accurate and up to date. And integrate Merchant Center if applicable.

It all signals freshness and relevancy to search engines and AI-driven local results. As a human, I can confirm that recent reviews, real responses to reviews, and helpful, reliable details matter. They refer to a couple of studies in the article but I didn't click through to read them.