You have never tried to cut steel with a blowtorch, have you?
It takes a very long time, when the steel is that thick and that deep. Long enough to attract attention. Nevertheless, you are just looking for a problem, aren’t you?
I have been around stick, tig, mig, plasma, air arc, oxygen arc, oxy-act cutting...
Note the link to the cutting speed is from ESAB.
Cutting with a blowtorch? NEVER, because it is simply not done.