Is it beneficial to gear swap like it was in FFXI?

I am thinking of making PLD my main. that being said i've always found it beneficial to have multiple sets of gear. but if gear swaps are possible and feasible it will change the order in which i try to optimize my stats and what gear i choose to meld. (IE: for damage sets i'll try to pick pieces i can use on a DD class as well as PLD. since i'd only be swapping into it right before i execute a high-damage combo. etc.)

If gear swaps are feasible, does anyone know if friendly spells terminate when a gear swap occurs? IE it was common practice to have macros say

/ma "Cure IV" Naomi

Rather than

/ma "Cure IV" <t>

to prevent interruptions to cures because your tank is constantly gear swapping to optimize mitigation and enmity.