You can't see how more potent and better rolls, bubbles, and a healer who doesn't favor running around in circles giving you Regen over cures is a better option for cping? Yikes.
You are giving Asura's playerbase too much credit.
Given the choice, I rather would use trusts too.
You're giving those trusts way too much credit. The only trust(s) that are really beneficial for CP soloing are sylvie, Koh/Koru, and Shantotto II for MBing. Both Joachim and Ulmia are no worse than a naked bard from the streets of asura, and they will just as quickly remove your precious 1 minute marches for ballads and paeons. Qultada's special is interrupting your skillchains with Burning Blade and double busting rolls. Cherukiki spends most of her time running around looking for a good spot to not cast any cures or -nas.
With that said, I solo most/all of my CP (I solo'd 100% of my JP on Monk and Dragoon from 1-2100) anyways xD. The only thing I wish could be done with trusts is I could buy them rema weapons and customize them with gear. Then I would never have any reason to join a CP group during campaigns.