Isn't all technology for technologies sake? Us human's just like building things that are better than current offerings. TVs; do we need them? Cars; do we need them? Hydrometers; weren't they originally just technology for technologies sake?
Tilts have their issues, attaching to rafts of yeast which build up and distort readings. But they do a job of keep curious fingers out of the fermenting beer. So FG readings might be a few points out, just use a different tool when the time comes (note I said "different tool" and not "hydrometer" which I personally don't own: Useless, fragile, bits of glass that are nearly impossible to read ...).
This is my Tilt that only arrived this morning (in a bucket of water, displayed using a TiltPi, not calibrated yet):

- TiltPro.JPG (20.57 KiB) Viewed 17838 times
Might look a bit different display-wise (more decimal placed) 'cos it's a Tilt
Pro. I don't imagine build ups of yeast will bother this one too much (it's huge).