I don't get pluralisation, certainly US based folk seem to be all for it, Brits less so. Perhaps it's due to a difference in the teaching of sets?

Here, I was taught

Set:Red a set with the attribult of being red

Set:Car a set with the attribute of being a car

the intersection in a venn diagram would be a set which are both Red and a Car.

Pluralisation also, IMO, leads to inconsistency in naming.

Take the table holding sales orders;

Name SalesOrder - and you call the table holding the associated lines SalesOrderLine - makes sense to me;

SalesOrders - so then you have SalesOrdersLines (or more correctly [SalesOrders'Lines])? That just looks wrong to me.

Or is it SalesOrderLines - which means you're naming the SalesOrder(s) element inconsistently