Originally Posted by
Ejell
There is actually no class which is better without the job crystal equipped. The job benefits more from the gear's stats (has been proved by theorycrafters) and this is far better than keeping 3 cooldowns.
Furthermore in the case of SMN, the fester and contagion spell are powerfull, playing without them is a great loss, and you still have access to Raging strike and Swiftcast...
Just as a reminder, with keeping the same stuff, you'll earn between 5% and 10% dps from your gear only with job's equipped, and a Blood for Blood gives 10% for 20s every 80, same as constant 2.5%.