Like any optional rule, I strongly consider what feats will bring to the table as far as supporting the vision and theme of the campaign. An example is my Eberron campaign where the PCs are larger-than-life type heroes. The feats represent a boost to power, capability, or versatility above the baseline expectation which fits with theme.
But if I'm running a typical zero-to-hero type game, I don't use feats. A possible exception might be if I expect there to be a large pool of characters in which case feats would be a good option to foster differentiation. Otherwise, nah, feats aren't needed in my view.