From the last eclipse, the difference between totality and not totality is night and day. Even at 99% you can’t take the eclipse glasses off. The closer you get the more of the secondary effect you can see, like the crescent shadows, and the overall dimming. here is an interactive map. The percent for each of the lines is on the right and bottom.
the next dev, Hey this obscure feature probably doesn’t work, should I fix it… No, I’ll just patch “temporary-fix-don’t-use” and let the next guy fix it properly.