Not really. You can still get metrics and analytics, you just don't include PII in it. There are tons of privacy-respecting platforms/services (both self-hosted and not) you can use, instead of just slapping Google Analytics on the website and having to show the banner.

But even so, I'd argue that since it's a small business, you'd do much better with qualitative data rather than quantitative, since it's a small business it's hard to make choices based on small amount of data. Instead, conduct user experience studies with real people, and you'll get a ton of valuable data.

All without cookie banners :)