No....it isnt stupid at all.
The maker of Trinity island made 2 versions, one for Low detail and another for Normal detail.
Now, on most computers running Low detail the low detail version will be fine, the same goes in the case of the Normal detail version for people running in Normal detail.
However, not all computers and OFP installations are created equal and there will always be some contrary cases.
The author of the island has done his best to produce versions of his island that will work for the majority.
If it is not right for some people, including myself, then it makes perfect sense to alter it yourself for your own use only.
I doubt that the author will be interested in any version I may have 'tweaked' to look better on my system.
It may not look right on his after all.
P.S. I think this topic is in the wrong forum
Planck