I am wondering why we should even consdier anything other than a linear viewpoint?
Why should you ever consider anything other than the way that you see things? Why are you 'here' on a philosophy site based on considering other perspectives, other possibilities leading to, perhaps, a 'greater truth'/understanding. That is philosophy. What rock would you leave unturned in pursuit of 'truth'?
If all you are interested in is the collection and use of 'fertilizer', all Perspectives of the elephant are rather irrelevent other than the one under which you stand with your bucket! You may get to know that end of the elephant quite intimately (the 'size' of your reality), but you will never get to know the whole elephant any better. Understanding of 'elephant' is rather limited, thus. Some of us are trying to better understand 'elephant' beyond our own limited views and perceptions; closer to the 'complete picture/reality'.
"The complete definition/description of the universe, at the moment of observation, is the sum-total of all Perspectives."
The more Perspective, the greater the 'included angle', the better one understands existence (for those interested).
All Perspectives are necessarily limited (to one extent or another).
Our world is as 'large' as 'our' Perspective (hence the 'sum total' of Perspectives being the entire universe).
Some are quite happy in 'tiny' worlds, some in 'larger'.
It's all part of the complete whole of Now!
(And sometimes my experience/reality is non-linear (exists). Does your lack of similar experience in your reality invalidate my reality?)