Here's the dirty truth about Coinbase:

They're not very good at engineering. This is a company that has had scaling problems from the beginning where they went down anytime there was a surge. This is also an org that took a year to migrate to react.js and made it sound like a major feat.

The fact that they find lightning challenging is not a surprise. Their competence is not in engineering, it's in getting money transmission licenses.

Their headcount is still bloated, their cash cows are going to be regulated away and they're not good enough technically to pivot to Bitcoin only. They're doomed.