Bill and John make excellent points.
Catches occur when the wood can drive down onto to the tool. In the catch the cutting edge is going as deeply into the wood as it can.
With a 1/2 bowl gouge this depth is limited by the depth and width of the flute at which time the tool just can't go any deeper and the gouge breaks free.
This usual results are a deep scar on the wood and sometimes a bowl is pulled from the chuck or the bowl being broken.
These catches can cause injury from the flying wood.
With a wide spindle roughing gouge a catch can go much deeper and wider into the wood since the flutes are typically an inch or more wide.
The resulting catches can be catastrophic, breaking, tools, tool rests, banjos, and of course inflicting much more damage to the wood.
My guess is you won't break a Thomson spindle roughing gouge so a big catch is going to break something on the lathe or pull the bowl airborne.
For the reasons above the bowl gouges larger than 5/8 diameter bar should also be avoided by those with "course movements"
Bigger gouges > bigger catches
Al