[spamizbad]

People new to the industry aren't always aware of how those "good practices" are simply a product of the industry zeitgeist. If you've just now gotten your feet wet, you're fully up-to-date.

For example, a preference towards writing pure functions might have gotten called-out during code review as recently as 10 years ago. Immutable programming can result in a larger memory footprint and/or more GC activity and years ago that was considered a deal-breaker... even in environments with plenty of headroom RAM and CPU performance.