Yup, this is a good idea. I think content like Expert Roulettes,EX Primals, Savage raids etc should be designed around party play.More difficult content being gated by advanced versions of the Hall of the Novice:
1. Hall of the Expert Roulette
2. Hall of the Extreme Primal
3. Hall of the Savage Raider
All of these should be difficult enough,updated every time a new tier comes out and solo duties. So by the time we're done with the MSQ and these halls, the player is better prepared for party play in more challenging content.
Yup, some of the friends on my friends list are simply from doing what you've stated.
So maybe, I'm an outlier. For the last 3 months, I've spent most of gameplay time crafting and gathering. Having played for about a year now, FFXIV's scripted combat simply does not appeal to me.
However, what does appeal to me, is all the non duty finder content,some parts of the MSQ,side-quest story and lore,exploring the overworld,content like POTD/HOH, glamour and just hanging out with friends/FC mates.
XIV's overworld is great place to hang out in and judging by stuff like "Doman Mahjong" that's gonna be added, XIV is really starting to feel like Second Life.