Seat depths (legroom), riser heights (height of each row), and shallowness and steepness. It seems people have getting these all confused.
Seat depth in the Gwladys Street and generally older stands and converted terraces are 660mm. The Park End is 700mm, somewhere like the Emirates is probably around 860-900mm. I think the recommended nowadays is 760mm.
Legroom is great for the sitters, but bad for the standers who want to be closer to the action, and closer to each other.
Riser Heights, stands are generally parabolas meaning they're shallower at the front, and steeper towards the back. The Gwladys St's risers are around 5 inches at the front to 7 inches at the back. The Park End and other new stands are around double that.
The Gwladys Street and older stands generate a better atmosphere as fans are closer to each other and closer to the action. They are shallow stands. ie small legroom and small riser heights meaning there are more fans per unit.
When fans ask for a steep stand because they want the fans closer to the pitch its not quite making sense but I think that they mean they want tighter legroom.
If you have fixed leg room, then how are bigger riser heights (steeper) going to make you closer to the action than smaller riser heights (shallower)?
If you fixed a riser height, then having larger leg room would make the stand shallower, so that would make fans further from the pitch and apart from each other. I think this what people are asking against when they ask for a steep stand.
However you would have a fixed seat depth for a stand and vary the riser height not the other way around.
That's a basic of it, there is more to it in terms of then calculating sightlines, overall distance of the pitch from the last seat, and there are minimum regulations that they have to meet.
So if you want fans closer to the action and closer to each other to try and replicate Goodison, then you should be asking for the minimum seat depths, and the minimum riser heights the sightlines will allow, asking for a steep stand is asking for something different.