Quite often it happens to me that values of resistors or capacitors don't play such a significant role. This is mainly the case with decoupling capacitors and e.g. LED series resistors. Often in decoupling caps their ESR and other characteristics are more important and I usually specify them globally as X7R/X5R. If I were designing more analog, this would not be as applicable, as in analog, component values/properties are much more strictly defined.
I, as a circuit designer, presumably have to be specific about the whole project so that the other people can take it and produce a working board. But this means that I put constrains on the purchasing department. If for some reason 4-resistor arrays of \$100\Omega\$ were not available, that could result in a delay, when the purchasing person reaches back to me with the issue.
Wouldn't it be fun, if the schematic defined more possible values for that component? For example it could say, that 80, 100, 120, 180 Ohms are all OK. Or simply define a range 80-180 Ohms.
But how to mark it on paper? Or more generally, is it worth it?