[pas]

I think the estimation accuracy is not the main point nowadays, but instead the simple fact that the viability/rentability of every project matters, and even if there's an up front pile of money to spend (quarterly/yearly budget), there are probably multiple competing ideas on what to spend these - and of course these usually consist of and involve software and its development.

Of course this is why having a low-fluctuating empowered team (project ownership, refactors, etc) can usually deliver changes faster and with lower cost and with greater consistency, than every time doing a new project (which might involve new people who never saw the stack, nor the business domain) to modify something on a system.