This game is in desperate need of persistent progression content for main jobs...

[Kalise]

The problem is a lack of people to do those content. There are people like the OP who don't have the schedule to do savage raiding, for example, while others cannot do it or do not like it. There is no point in creating more content for people who won't do said content. As a theme park MMORPG, you get more mileage out of FFXIV if you can enjoy and do a variety of content. Otherwise, outside of keeping your house (and maybe FC ownership/rank/membership), you can just unsubscribe when you've done what you want. People just need to not view that as a problem if the latter is the case for them.

Well, the thing is that Savage Raiding is literally only one type of content that utilizes full Tome/Normal gear. Not everyone is a raider and thus interested in doing Savage raiding.

There is nothing else that will utilize said gear.

Even worse is there's literally nothing that utilizes full Savage gear. Obtaining the gear simply means you can now... AFK in Limsa with slightly more stats than other people.

Though, the next issue would be implementing things that aren't Savage but still have longevity... Since, for example, you could in theory add another 4 Raid encounters for both Normal and Savage with min ilevel of 480 and 500 respectively that offered no loot but then people would simply run it once and be done with it... (I suppose you could let it drop gear for alts? Since that's always a complaint, that weekly lockouts on Raid loot and tomestones means gearing up alts is impossible if you're spending said lockouts on your main job)

The same could be said about adding in 480/500 min ilevel dungeons/trials...

Really, the best I can think of would be Eureka. Only without its absurd ilevel sync. So that progressing your gear, actually upgrades your performance. But even then, there's still the issue of "What reward do you put there to make people actually care about doing it?"... I suppose the Relic? A shiny glam given that generally they're only BiS for like the last patch of an expansion...