Light switch with 3 sets of wires (not 3 way)

I'm trying to replace a couple of old switches with new dimmer switches that have the wifi capability. I understand electronics fairly well and have done basic electrical work around the house before. But this situation has me a bit confused. I have 3 wires. The 3 grounds are "pig tailed" the 3 neutrals (white wires)are tied together with an wire twist. 2 blacks are pig tailed and one is alone. The old switch is single pole and the black pigtail and the single black went into the back. Ground was around the screw. When I connected the new switch, it required the neutral wire. So after connecting the 2 sets of black wires and neutral into the switch I tries each neutral individually but no luck. One of the neutral would light up the switch but not the light. Later I discovered that by disconnecting the neutrals I lost power to my outlets. The switches I'm replacing are in the bathrooms and the outlets were in the bathroom and one in a bedroom adjacent to the bathroom. The idea is to pigtail the neutrals and connect the tail to the switch. This way it won't interrupt the circuit and provides my neutral for the new switch. Does this make sense? Thank you for the feedback.