Personally I feel one of the biggest improvements of the Red Mage over the last few iterations was being able to do the combo with only a 60% gauge.

Sure enchanted Reprise kinda falls by the wayside, but the ability to do combo upon combo has been huge.

One of the biggest additions I noticed was the Scorch and Resolution both adding Mana back to the gauge. It is so easy now to have another combo very quickly ready that I rarely have to spend time verthunder/aero anymore. Scorch was paying dividends in ShB but boy when you added Resolution to it, its just combo after combo these days.

One of the biggest changes I've noticed in playing Red Mage throughout the iterations is that even though it started as a kind of in and out fighter... nowadays due to the way it all works its firmly a job that stays mostly in melee range in order to take advantage of those continuous combos. That being the case...

1. Magic Barrier needs a 20 second duration if the CD is gonna be that long. Should at least be comparable to Embolden. It never should have had a 10s duration, that was utterly done without thinking.

2. Because of the way the continuous combos work and having to spend the majority of time in melee range and almost never leave... I suggest a new personal "heal" akin to Adlo. Keeping an Adlo style Preheal on you will give the Rdm staying power on the front line. Which can be a problem. So while I realize RDM DPS is NEVER going to be at the level of other DPS jobs, (or they would have done it long ago) it does need staying power on the front line.
RDM may not get damage... but he would then have Defense.

3. The reason I suggest Adloquium style is to differentiate it from the BLM and SMN Shielding and that type of a Shielding would set it apart while still maintaining staying power for the RDM on the front line, and fit the WHM?BLM/Fighter combo it is supposed to be.

Again this is all due to how much the RDM has changed since it's inception back in Stormblood.

I personally do not see mobility problems with the class right now, and most of that has to do with the fact I rarely have to spend much time anymore Verthunder/VerAeroing to build my guage back up. That USED to be the largest portion of my time spent Red Maging... It no longer is due to how the gauge and buildup, work much faster now. Most of my mobility is either handled with Corps'a'Corps or Displacement, because I need to be in melee range nowadays. If I'm out of it, it's only briefly.