I dont know if new datafields could be auto filled / scraped with fcc data or if FCC allows "scraping" or if other databases do that - or if there are some scraped fcc databases existing "in the wild"
adding a "FCC date" could provide a "first" date without clicking the fcc link : visitors (and/or non-US) dont necessarily know that behind an fcc link there is some date info - or what other info the FCC provides
also the other "indirect" date - the openwrt first version might not be "intuitive" that the first one like a 20xx year
because of regional differences and vendor policies "availability" can vary between regions too
Indeed the performance might be more chipset related
"old" chipsets are not necessarily bad - but for some consumers when they buy a brand new device and discover some more obscure stuff / feature "problems" or misinterpret the numbers because they are not exactly defined or "visible"
maybe make https://openwrt.org/meta/template_dataentry_background / "Conventions per characteristic" better "findable" / more prominent on the page ?
With the growing number of 802.11 addendums and tweaks and potential different feature sets between OpenWrt and vendor firmware the buying decision isnt getting any easier for "normal" users.