It's entirely possible that on-die ECC is still a good thing for the end user - to really judge you need to compare the error rate (and proportion the ecc corrected) of dies that would have previously failed validation. It may be that it's good for both - IE more dies can be used (so higher supply and lower prices to the consumer), yet the un-fixed error rate is still lower than dies that would have previously passed validation but lack on-die ECC.

I doubt any manufacturer would make that public, however, but an estimate may be made if error rates actually start increasing in the real world due to ddr5 allowing this.

I agree that end-to-end ECC really should be the default for consumer products these days, but so long as the big players see it as a "Professional User" product differentiation point it'll always be more expensive than it should be.