You will free up a lot of time using a macro by not having to constantly babysit your NRG bar (unless you are okay with wasting NRG) which will allow you to play the game when you want. TM Farming is the most efficient way to give a massive boost to your team, and make it easier to clear ELT level content. Having a selection of TM's gives you a lot more options when it comes to building your units and gives you a lot more options when it comes to strategy. (Eg. Evade/Auto-Refresh/Element Resist). Once you have a good selection of units, you should consider putting your resources towards TM Farming instead of doing more pulls. For 50$ you can either do a bunch of pulls and probably be disappointed or you can spend it on 5 TM's which is a sure thing. Besides, even if you do get lucky and pull a good unit, it will never reach its full potential without proper gear. All those Mega-Whales you see on your friends list with a ton of TM's, chances are they used a macro to acquire them. Units get out-classed very quickly due to power-creep. Take Lightning for example, she used to be the must have, gotta whale for, unit. Now she's the troll of 5*'s. Good TM's like Dual Wield and DualCast will always be useful and you can transfer them from unit to unit. Not only is TM Farming good for building up your units trust, but you will also get a bit of rank EXP, and tons of friend points and Gil from selling the excess materials you pick up.