Small plot has more usable yard space than a medium plot.

[Iscah]

I would honestly just like more options in decorating the yard of the houses period. Even when you use up the maximum allotted item space, the front yard can still seem kinda bare.

If I want to consume my front yard with shrubs and trees, for god sake SE, let me.

I think that would be to do with not overloading the zone with too many objects, and potentially crashing or badly slowing down computers that can't handle it.

I know I've had friends comment that their game locked up after entering someone's heavily-decorated house - which is possibly why the game automatically loads you back in outside the house rather than in it.