Scaling means something different in this context IMO. It's not whether your DB can go from serving 100 to 10000 users, it's whether your B2B app can serve 100 to 10000 different real world customers without starting to fall apart. While it becomes an unintelligible 40000 line "if else" tree that breaks in a new way every time you open a ticket with your agent to Vibe Jira a fix (but forget to specify 1 out of the hundreds of niche constraints that someone doing the job likely knows from experience). You then ask it to reimplement cleanly, but it basically reimplements the broken mess of business logic you're trying to escape since the current codebase is the only reliable source of truth.