Yes, this is true for any stone stove.Being this is my first exp with using wood stove heat exclusively it may be hard for me to foresee how I’d feel about it.
However I’d say I’m doubtful I’m picky about it getting up quick enough for me.
But that is a good consideration for me to think on. Seems like that would be the case with any soapstone situation.
Basically, soapstone soaks up 2x the BTU's that the same mass of iron/steel does. So, when starting from a cold stove, it takes ~ 2x as long for the mass of the stove to saturate with heat and start "throwing" heat to the room.
This is an issue during "shoulder season," when you are not burning 24/7. (Oct and March here.)
Once you get the stove going for heating season, the point is moot, because when you reload, say 2x /day, the stove is going to be warmed up already.
The exact opposite case would be a cabin that you visit on weekends. That stove's job would be to get a cold cabin up to temp ASAP when you show up on Friday evenings. I would want a steel stove for that task.