thats a very nice kit.
you just use what works best for whatever project you might be doing.
back in the 50's 60's 70's model building was a hobby that probably millions enjoyed. model making like , ships, airplanes, railroad, cars, buildings and architecture, rockets, etc. you know, back when you could buy a chemistry set at sears and roebuck, Montgomery ward, the local hardware store or hobby shop that included hazardous and deadly elements and chemicals.
Excel has given X-acto a run for the money and probably offers more knife or hobby sets than X-acto currently offers.