why grouping plugins is good

[DerManoMann]

A while ago, yellow mentioned that having multiple groups of plugins is not necessary. Although I started reducing the number of groups initially, I do think groups are good. The main reason is that the sort order applies to each group. That means in cases where sorting is required/wanted (for example payment modules), this comes in handy.
Apart from a handful of 'fixed' groups that we'll eventually have (like order totals, etc) the user will be free to group plugins as they wish.