The second dropdown is the one that matters
Pick Stihl and you have eliminated almost nothing — you are still looking at chainsaws, trimmers, blowers, hedge trimmers and cut-off saws. Pick Chainsaw and the list becomes readable. This is the opposite of automotive, where Make does most of the narrowing. It is also why an automotive-shaped schema makes power equipment catalogs feel broken: there is no slot for the thing that does the work.