Valve pocket/bowl hog tools....

Bowl Hogs were big several years ago. They had their place, and were valuable to those who were in classes with porting restrictions.
The problem with them is that a guy can cut too deep with them and screw themselves by not leaving enough room for a proper valve job.
And if you're doing full port work, you end up grinding out all of the tapper anyway.
Like a lot of the other men on this forum, I use Souix equipment. I even have the Serdi multi angle cutters.
But I still end up going the stone route, cause I can move the VJ around.

To answer the bowl question tho…. What I do 95% of the time is find, or cut, a stone (90°/sharp edge) that's 88% of the valve size and bring it down to make a concentric MARK in the OE seat and grind to that point in the bowl. (yes, I have lots of stones)
This leaves plenty of room to fit 2 angles below the seat and some area for blend.