Hmmm, I never thought of prepping. I've got tooons of the gathering/crafting xp boosters from all the job quests that I never used. Didn't realize there was a +15% xp battle character booster. Will need to grab some of those.
That makes sense for daily turn ins, but once you hit 71 won't the turn-ins all be from Shadowbringers areas? So you're just getting a head start on lvl.70?
And with Dancer, won't you just be able to walk up to a vendor in Shadowbringers and buy gear that'll be pretty close to the Scaevan gear? And since you have crafters/gatherers, you can just gather stuff from the opening map and craft HQ gear that should be on par with or better than Scaevan gear.
Not all I think, daily turn ins seem to pull from the 6 highest you can do, so once you're 71, it should be 3/3 with the 70 ones still. One 72 it's gone, but I only got a couple of each prepared in advance and I'll do the rest as needed, and any excess I'll just sell, people who didn't prepare will buy them just fine so I'm not worried. Same for leves, I prepared a bunch of 68 crafting leves, to turn in right away and a few more to turn in until we get to the leve city(might be right away like Ishgard, but could take a little while like Kugane). Any excess I can sell.
The 15% xp stuff replace the FC buffs and don't stack with them, so for many FCs, they'll probably have aetherial wheels charged up with 15% combat for a few days, maybe even a few weeks but past that I think most will default back to 10% that's why I got a bunch in advance. It's not like it costs anything anyway, might as well get something and other than getting MGP ones for turning in fashion report, there's only really prep for the expansion that's useful and I have already many crafting/gathering ones so I figured I'd get combat ones too.
For scaevan gear, not really. The top tier tome/savage gear is always higher than the entry level gear on vendors. The vendor gear will probably be 385, while Scaevan is 400 upgraded. Scaevan is 73 gear basically, so it's better early on. It's not a huge difference, and you'll be able to buy scaevan with poetics, but it's more about finding stuff to do before the expansion in a way.