Every time I hear “mongodb” I think of that guy from Blazing Saddles that punches horses.

My employer thought it would be cheaper to use Mongodb then hiring people who understood SQL - then free turned into a subscription, and a support plan got added in, now it’s a six figure expense per year. Plus it turns out that developers who don’t understand SQL are really unbelievably bad at everything else database related, so all the Mongodb queries end up being linear scans, and the apps fall over when the dataset grows beyond core memory size - because the app developers like to read the entire collection into ram then iterate through manually and pick the records they want.

It’s a huge rewrite when they can no longer do that.