Personally I would never unpot an orchid or any plants just to see if it needs watering or
not..... that would just set back the plant. A lot of people uses the skewer method or
lifting and feeling the pots, I usually grow bareroot/mounted and for those potted, i have
them in transparent containers that way i can see the roots and how moist the media is.
I would unpot an orchid if i suspect that the roots are rotted, if my suspicion is correct i'd
repot immediately and hope it'll make it... if not, i'd repot anyways to give it a fresh mix.