I perfer to buy a handgun with an optic cut whether I plan on using a red dot or not. I don't have to use a red dot if I don't want to, but I'll still have that option in the future if I ever change my mind.
Most micro red dots for single stacks and micro 9mm's (Hellcat, P365, etc) are under one ounce. The Holosuns, Trijicons RMRs, and the like for double stacks are around one ounce. I doubt anyone who was blindfolded and had a red dot and non red dot pistol put in their holster could tell the difference.
As far as bulk goes, I personally haven't found it any harder to conceal or any printing when conceal carrying an optic on a pistol.
The only annoyance is that dust deodorant particles, oils, etc build up on and around the glass that has to be cleaned regularly. It's a little more maintenance vs other pistols without the optic.