Full fidelity is harder to use, yes, and far more tedious. FC3 has far less systems to deal with. Only the necessary ones remain (radar, flaps, gear, weapons, etc.), and none of the lame stuff (stores selection, aligning INS, adjusting ADI, selecting fuel flow sources). I find it very immersion breaking to have to precision click tiny switches in the cockpit all the time while keeping my head absolutely still so my head tracking doesn't move and make me click the wrong thing. I'm not interested in dealing with fuel balancing issues or running through checklists in my head for cold starts. Trying to fire rockets during a mission in the F5-E, but not being able to because the select jettison switch was set to "select position" instead of "off".
I want everything great about DCS minus the distracting 'systems'. I can't go back to full fidelity after trying the FC3 planes. They've been so much fun because I can focus on the parts of military aviation I love.