I've ran into this with teams before. I think it's critical to ask ourselves "Who really are our stakeholders?". More often than not, the answer boiled down to a.) our customers and b.) our sponsors. If someone from sales, marketing, support, infra, or anywhere else lobbies for anything that'll turn into work, we work with our PO to make sure this is something the product team (customer by proxy) or sponsor(s) really think are important.

Time and time again we've butt heads with the sales team because they promise the world to one or two leads before checking back in with reality. Those interactions are met with checking in with stakeholders to validate assumptions. we gained the support of our executive sponsor or customers who are actually paying for the product to be built. Asking that question insulates us from greasing internal squeaky wheels.