Cliff, I see your logic, definitely forcing perspective…
But how I was thinking was that if you did this, the HO would be so far in the distance, you could not appreciate any of the detail of the locos and rolling stock.
That was how I came up with the reverse, putting the HO nearer the eye allows taking all that nice detail, but being smaller it needs to be closer. The G being larger, can “withstand” being further away.
That gave me more of a blend and still could enjoy the far away trains. Also, putting the G closest makes a loop pretty much impossible, the track needs to be pushed out to the limits of the shed.
Not arguing, just presenting my reasoning.
Greg