It's actually great for highly complex, high traffic setups as well - Smashing Magazine was a conglomerate site using Wordpress, Kirby, Rails, and Shopify, and are now entirely static (10x faster literally) and using Netlify CMS for content management. If you haven't checked out their site lately you should!

https://www.smashingmagazine.com

https://www.netlify.com/blog/2017/11/21/smashing-magazine-is...