You can have some lenience such as dropping it down a bit. So that you can use for example Shisui's 270 stuff in Bardaam's in lieu of vendor 273.
Perhaps you can even dip down further and allow the level 62 ilevel 265 stuff in Bardaam's too.
Since it's not particularly hard to keep up on gear level requirements.
MSQ already implements ilevel checks for max level content.
Having it apply to leveling content wouldn't be out of place. Especially not since MSQ literally throws HQ gear at you. Players shouldn't have difficulty meeting ilevel requirements for leveling content.
To say nothing about you know... Making sure you are actually an effective participant in said leveling content.
Even more so given that ShB are bringing in the Trusts to allow people to solo the MSQ dungeons, so having some requirement for players to be able to meet some minimum standards for DF play isn't exactly going to be a big issue blocking people from MSQ advancement (Which again, should be gearing them up anyway)
The fact that they will eventually have to gear up for content beyond X.0 MSQ in a way that isn't "Just buy some stuff from the vendor using Gil" and is instead relating to farming stuff like Centurio seals, Tomestones, dungeon gear, purchasing/making crafted gear, grinding out "Eureka" content or doing previous raids should also be a sign that you should be preparing players for maintaining their gear anyway as they will need to do it for MSQ content outside of the leveling duties.
