Is it necessary, not really, but if you have the budget why wouldn't you do it.
There is more to using a lot of equipment than "if you have the
budget..."
I am a huge advocate of DIY lighting. What I don't understand is
why you feel pro equipment is for "the techie and gear Gods". As
you point out, the sun moves during a shooting day. When a
production need 6 to 8 hours do do the shot you mention is it a
money and time saving necessity. It isn't an "if you have the budget"
situation - that lighting, in that situation is necessary. Perhaps what
you mean is someone with no budget can still shoot in a barn middle
of the day in June with full sun and get a good image. It may not be
necessary for someone like you, but when I have a full crew and
extras and I know it's going to take 8 hours to shoot that scene it's
necessary. I just can't afford to shoot for the 3 hours the sun is in
the right place and come back again the next day. But if I have a small
crew and no money to rent, that's what I have to do and I will make
the best of it.
I use pro lighting because it saves time and gives me a better look and
saves time. Not because I am enamored with equipment. You have read
my DIY lighting posts - if anything I am enamored with getting great
lighting with "home depot" lighting.
There is no debate here. A filmmaker can get great lighting with "home
depot" lighting. I feel using pro lighting is more than just "if you have
the budget" or for "the techie and gear Gods".