[MHGinTN]

"If you change the mass of the black hole, you change how the black hole relates to the galaxy." Ya think? ... Ya mean a ten inch drain will suck out pool water faster than a four inch drain?

[ETL]

Re: "If you change the mass of the black hole, you change how the black hole relates to the galaxy."

Ya think? ... Ya mean a ten inch drain will suck out pool water faster than a four inch drain?

If you increase the mass inside a black hole, the 'event horizon' (the distance from the BH center in which objects must exceed the speed of light in order to escape the BH's gravitational field) grows to a larger diameter. The 'singularity' at the BH's center, being an infinitely small region of infinitely concentrated mass, stays the same size, at least as I understand it.

[ETL]

In other words, I think you’re right.