If you have ever used a ST about the only place you can put it on the table comfortably is parallel to a long rail. Everyone knows that your stance is slightly different in this position when compared to shooting a ball straight into the side pocket.
So using an ironing board, taking out the heigth factor, it is better because you can move your body to simulate a more square stance for example.
As long as your muscles make your hand end up on your chest as the BCA instructors teach, your muscles will be trained properly. You can have a square stance or the traditional American stance and you will get the exact same results.
At home I have set up my pool table on 2 inch blocks of wood. That way I can practice longer since I don't have to bend over as far. Fast Larry thought it was such a good idea that he was going to recommend this to eveyone. Ask some of the older players here, pool tables used to be higher, a lot higher than today's tables. I think they are trying to make tables cheaper, and the less wood the less the costs of manufacturing.
In the early 1900s we had the elephant leg tables - huge heavy pool tables that were very high in the air. I used to play on them all of the time in the 60s and 70s in Roanoke Va. and in Charlottesville, Va. I am sure that Luther Lassiter player on these high tables and did we ever here about him or anyone else for that matter complain about today's lower tables? I think not.
Anyway, to make a long story short, I go from playing on my higher home table to league night playing on the lower tables with absolutely no noticeable change.
To you it might make a difference however. I can't tell but can only suggest that you try it out. There are a lot of players who just throw the ST on their kitchen table and go at it. One of the things the ST does is to keep your wrist from twisting on the backswing. And you have to follow through straight also. It doesn't matter how you stand. Again, if you think about it, you rarely stand the same way on every shot at the pool table.
Now I will admit that you may have a point in that this could slow my progress, but personally I don't think it matters.
Regards, WW