My whole comment was just about a meaningless plug-in, whose functions can be easily replaced.
Of course, you can say that any can be replaced with more effort, but the question is why?
If giving up a plugin means a little more work I give it up because although I am not against more plugins myself I prefer to have a reasonably clean, conflict-free WP environment. For me, a dozen or so plugins are enough, of which I can easily go down with the number of plugins to a critical few.
The stated 100 plugins is an extreme. There may be sites operating with this number and doing well, but it is an extreme. Just like the other way around, e.g. giving up one plugin that increases usability, just to have 8 plugins and not 9 for example.