but taking delivery of the original spec would have meant you could have equipment delivered ten years earlier, at lower cost, and have the use of it for ten years...
instead of having nothing because the order keeps changing.
Imagine you ordered a new bathroom for £10,000. Just as the plumber has fitted the new bath and was screwing the gold-plated taps into place, you tell him to take the bath away and get a jacuzzi instead.
Some time later, after he has bought the jacuzzi and rerun the pipes, you tell him you've changed your mind about the tiles and want black marble instead.
he fits the new tiles and you tell him you've decided you want stainless pipe instead of copper, so he hacks out all the walls to change the pipes.
He fits the new stainless pipes and you tell him you've decided on underfloor heating so he has to pull up the floor and wreck the new maple flooring you asked for.
He fits the underfloor heating and new flooring and you tell him you've decided on a wet-room.
Your notional as-now-planned bathroom is much nicer than the one you had originally planned
Six months later, you stink because you haven't had a single bath or shower yet, but you've run up costs of £50,000
In those wasted six months new technology has invented an ultra-sonic hot-air drier for the bidet, so you revise your plan again and budget an extra £5,000. You tell people the change is essential because technology has moved on.
And you still haven't got a functioning bathroom.
Your plumber has made a fortune and your wife is blaming him for being slow and expensive.
Your Project Manager has resigned and gone to live in a cave.