Yes it is. Trying to look at a not-very-exotic .25µS pulse coming out of a microcontroller on a 10mhz scope, you have to expand the range, crank the brightness, turn off the room lights, squint...
Both you and Nigel are correct in specific ways... 10MHz scope is very useful for most troubleshooting .... and the lower line brands like B&K do not employ the quality crt's as Tek, HP and similar lab grade brands do, hence the reason to crank up brightness, etc.