It seems like using CNAME workaround or using a non-CNAME ECID service implementation both result in a 7 day cookie expiry. Is there any benefit to setting up CNAME workaround today? Is it the Product team recommendation to still do so?
There are other benefits to setting up a CNAME for ECID tracking, though you’re correct – it will still result in a 7-day cookie expiration. The other benefit to consider is ad blocking. There may be some ad blockers out there that are blocking calls to Adobe data centers, but aren’t blocking the CNAME first party customer domain.