Lack of built-in flash on OM-D annoying or frustrating?

since i got mine E-M5 i haven't used that flash once. don't know if it even works. all indoor shots i get with available light.

one thing i found is that when you have longer replacement rubber hood for evf, you can't mount this flash. if you try to mount the flash with that evf hood on you can't get it to go into accessory port, and if you remove evf hood , you can attach the flash just fine, but you can't put the evf hood back on

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my gear:
E-M5+45mm/1.8
E-520+12-60+14-42+70-300+Sigma 105 + FL-50R+EC20 + SRF-11
and good number of legacy lenses (list in profile)