Even though Commodore made the instructions available, and made a PCB revision tailor-made for the upgrade (6A/7), they also made it very clear that at least for the A500 it would not be a supported configuration.
On the other hand, 2 MB chip RAM on the rev6A A500 using the 8372B Agnus in its "natural" mode (single bank of four 1Mx4 chips) clearly had their blessings.
That said there's nothing wrong of course with the 1 MB chip RAM mod, Commodore not supporting it was just a marketing decision.
I suppose that depends on what the definition of "not supported" is. It was a *required* procedure in order to use the A570 and dealers would perform it under warranty.
