It would be an advantage. How much depends upon the location of the table, the time of the year, and the weather outside. In virginia at this time of year I suspect the advantage would be minimal because the heat is on all the time and the tables really get dry on their own. That is unless the building has a boiler in which case the air will not be dried out and heated table would be supreme. Of course in a crowded pool room the humidity seems to rise even with conventional heating so it might be a huge advantage afterall. A big dehumidifier also would help in these cases.
Basically I think that heated table would be huge advantage in every case except for an empty room in a wooden building without radiating heat on a non ground floor in the middle of winter in the northeast. The bed is super dry on such tables and backspin simply stays on the ball much longer with minimal effort on a super dry table.
As for the surface of the balls and their tendency to cling in humidity i dont know how the heated table would affect this.
The question is that I never have heard brought up much is mosconis run took place march 19-20th in ohio. This coresponds to appoximately the first day of spring that year.
www.extremeweatherwatch.com
According to this data the high was 55F on the 19th with .75" of rain and 44F on the 20th with no rain.
From my experience of playing pool in Ohio the 19th and probably the 20th as well would not have been good days to play pool even with the heating because of that rain. We don't know for sure if Springfield, which is very close to Dayton was spared the rain. I do know tables in Ohio don't play as dry with 55F outside compared to the middle of winter with say 20F outside regardless of rain or not.
In this weather there is no way the AC was on. From this data it sounds as if it was not a good time to be playing pool in Springfield OH the day Mosconi ran 526 balls.
Fast forward to now we have rumors of heated tables for both JS and JS, god knows if they are true or not. There is no question that new Simonis 760 plays better under humidity than whatever cloth mosconis run was made under.
I guess we will probably never know because the powers that be won't release the table specs for JS and JS but it sure seems like they had better atmospheric conditions than mosconi: Whether or not theirs were artificial (heated bed) or not.