I guess what i should have said was work beyond the basics or somewhat advanced things.
Wasnt meant to be loaded, and i see your point but... to me a chrono is an essential tool if you are doing anything beyond the basics with your gun. A dyno costs a shitload more than a chrono
I dont know much about bikes but i am quite good with cars. Dunno if this means anything but imagine working on a smallblock without... a timing light... or a modded turbo engine without a wideband o2 sensor i guess? You can do it, sure, but once you have those tools you cant imagine living without them.