I've always been confused as to why Rando racks are shaped the way they are.
The typical rando rack looks like this Nitto.
See the platform? It's about 4" side to side and 8" front to back. They are all about the same.
This is great if you have a bag that is about 4" wide and 8" deep.
If you did have a bag like that, it would look like this Zimbale.
Rando bags are typically 6" front to back and 10" side to side.
This is great, except when plopped on a rando rack the sides are unsupported and there's a little extra rack sticking out the front.
Pictured is the wonderful, smart, and beautiful bag by Ron/Acorn.
Of course, some people mount a light up front.
Some say the extra front rack supports a 3-D pocket.
Some say the bag sag helps keep it on the rack.
Some people carry a minimal load, so don't need the support.
Here's an idea, a rack made to support your rando bag.
In fantasy land, it would be 10" wide, and 6" from front to back.
No sagging sides, no extra front rack sticking out, light mounts would be on the side.
Also, the tombstone/backstop would be vertical, not slanted. The slanted tombstone matches the angle of the headtube, so the rack looks good when there's no bag mounted. I get it.
But how about a vertical tombstone that isn't a pain in the ass to use when mounting your bag?
Some people will say it'll cantilever forward and snap. It won't.
There's no place for the bag to cantilver forward to, the rack deck is supporting it.
Images below are from Winter Bicycles. Eric also makes traditional style randonneur racks.
Next time you buy a rack, do yourself a favor and get the correct rack for your application.