Salads should be eaten from bowlsFor years I ate salads from plates.
I now think this is a sub-optimal approach.
I now think it makes a lot of sense for salad containers to be relatively large and deep.
AdvantagesA deep container better contains the salad, its dressings, and any run-off.
It also makes it easier to mix things together, and evently distribute any dressings - so that no separate mixing bowl is needed.
DisadvantagesUse of bowl makes it less practical to use a knife to chop things in situ - the salad need chopping up before it goes into the bowl.
Leaving things on the "side of the plate" becomes less practical - a separate trash bowl is often needed. I found I tended to use one of those anyway - even when eating off plates.