Your timeline is a bit incorrect.
Anemos was not released until the 4.2x series, in which Deltascape was already over and the current baseline for the tier was i350 (crafted gear). The Anemos gear was i350 with 5 guaranteed meld slots; the weapon i355 with 5 guaranteed meld slots. Gear was on par with the i350 crafted and Sigmascape normal mode gear, and the weapons were on par with Byakko Ex - both of which were released in Patch 4.2.
I was progging V8S with the i350 Anemos body piece because it was better for BRD than the i370 Mendacity body, offered better substats and 5 VI Crit melds spots (which put it ahead of the i350 pentamelded crafted piece), and BiS was the Diamond Coat of Aiming. I was not clearing Deltascape (4.0~4.2) or progging UCoB (4.1) in any piece of Anemos gear; it was all Genji/Augmented Creation gear — because the cap was i340 at that time, and you couldn’t obtain any i350/i355 gear.
So, technically, Anemos gear was better than the Deltascape gear, which was only i340 and now obsolete because it was a new tier. Some of the i345 +2 pieces are actually in BiS sets for the Unending Coil of Bahamut.
It really isn't.
Tank accessories have involved crafting accessories since Deltascape because you can pentameld them, and the Savage accessories do not offer enough in terms of stats to offset the gains from pentamelds (mainly with regards to STR because the STR value is lower on the Savage accessories for both Deltascape and Sigmascape—Alphascape is a bit better but I believe that there are still a few tanking accessories that are i380 crafted).
Other jobs have used pentamelded accessories since Sigmascape as well because of being able to pentameld substats - BRD used an i350 bracelet with nothing but critical hit in it because the Savage bracelet and Mendacity bracelet offered 0 Crit, and that substat is more important to a BRD than any other. We sacrifice main stat and weapon damage if there's enough Crit involved.
The crafted accessories being BiS is not intended by the developers. They tried to improve the i340 Savage over both i320 crafted and the old i270 accessories by slapping STR on them (because, at the start of 4.0, accessories were now locked to role and fending did not have STR on them). Worked enough for people to not actually prog Deltascape in i270, but the i320 crafted were still better because you could pentameld them.