Most system design interviews focus on diagrams. Real systems fail because of trade-offs.

I’ve noticed that many system design discussions (and even interviews) spend a lot of time drawing boxes and arrows, but very little time discussing the trade-offs behind architectural decisions.

For example:

• Should you optimize for consistency or availability?
• When is a monolith actually a better choice than microservices?
• Is event-driven architecture worth the added complexity?
• How much latency is acceptable if it improves scalability?
• When should caching be avoided instead of added?

In production systems, these decisions usually matter far more than the diagram itself.

I recently wrote an article that explains several real-world architectural trade-offs with practical examples rather than interview buzzwords.

I’d genuinely appreciate feedback from experienced architects and backend engineers—especially if you disagree with any of the points.

Article:
https://medium.com/techtrends-digest/system-design-is-about-trade-offs-not-diagrams-3afa4f002948

Question for the community:
What’s one architectural trade-off that completely changed the way you design distributed systems?