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>The ideal application:

>- and has all the features in the world

In this case it's okay if it uses up all disc and memory. Actually it can even cost something in this case because only one application is needed.

It should be open source though so users can audit it and fix bugs if required. You see, just by requiring consistency in the requirements, one can get very far. Optimizing for typical startup metrics is just one way to do things but not the only valid one.