[onion2k]

Isn't this precisely what leadership is for?

If your devs are just implementing whatever system design is coming from your tech leads, and having no opportunity to have an input or their own, you'll find you have very unhappy devs who don't hang around very long. That churn will make it impossible to build a decent system.

[jpk]

If your devs are just implementing whatever they want, with no strong design from your tech leads, and leaving no room for input from other teams, you'll find you have very unhappy customers who don't hang around very long... etc.

It's a balance.