The idea is, instead of making the timestamp jump around (leading to both overlap and gaps), to make it a continuous linear counter. What's misguided about it?

The idea is, instead of making the timestamp jump around (leading to both overlap and gaps), to make it a continuous linear counter. What's misguided about it? I realize we've been stuck with the Unix timestamp for so long it's become somewhat impossible for many to acknowledge the points where it breaks.