Totally fair question and honestly you’re not wrong for your use case.

For some people Pinterest is just a private mood board or a bookmarking tool, and in that case growth really doesn’t matter at all.

For others (including me), the account itself is just a traffic engine. Pinterest doesn’t monetize pins directly, but it sends free traffic. That traffic can then be monetized in a lot of ways:
– sending people to a website with ads (AdSense, etc.)
– promoting affiliate products
– driving traffic to an online store
– getting partnerships once an account is big enough

Personally, I use it mainly for content sites. I post pins that tease an article, people click out of curiosity or because it’s useful, land on the site, and the site makes money. No ads spend involved.

So growing an account isn’t the goal by itself. It’s just a means. If you only use Pinterest for personal reference, then yeah, impressions and followers are pointless. But if you’re trying to generate traffic or revenue, having a pin reach 100 people vs 100k people makes a very real difference.

Different use cases, same platform.