Example- I have an old VXii 2x7 that has lived on a 45/70 for most of it's life and many of my handloads have been, let's say, not factory. It still tracks, still zooms, compared to new, optics still very decent.
If you have a pressing need for the latest, clearest, greatest, then by all means, spend your money. I'm in the school of if it ain't broke, don't go fixin. There's an interesting video on Utube by tiborsaurusrex, who has a pile of vids on long range shooting. In it Matt compares the new variable scope from SWFA to the original 10x. Both are built like the proverbial tank, but his take, if it ain't broke and still working fine, don't fix it.