It takes a lot of torque to get a 20 year old sealed bearing bottom bracket out of a bike. If you tried it with an improvised tool (screwdriver and hammer?) you would probably wreck your bottom bracket and still not get it out. This tool fits perfectly, and has the strength to handle the torque without stripping. Basically, indispensable for this job.
Park & Campy tool bias, snob. 30 satisfying years of using tools from these makers. Quality & durability are why I stick with Park. Using the BBT-22 as a single speed freewheel remover. A vice, Park SR-1 chain whip, 1 or 1.25 wrench all fit the tool.