Earth Mountain is making the dream come true, page-73

"... Yuval was right, MEMS =, Missing Every Milestone. They are just late, always have been always will be! ..."

"... if they are always late doesn't that mean they will never be ready? Not an unreasonable take... ..."

This is wisdom borne of experience, but at least he can make a self deprecating joke about it. That is not something you can do if you know that it is always necessarily true. I suspect that Yuval knows after the fact that the implementation was harder than anyone initially envisaged, but from the accrued experience of solving all the problems he also knows it will come to a fruitful end eventually.