Have to agree with you Paul.
Most of mine have been 4 variations.
Most common are the two smaller sizes.
Smallest is a micro with a MCR relay.
Next is a larger micro or a small rack, maybe a starter or reverser. Could probably put in an oversized IEC starter with adjustable overloads and get by with it as a standard universal.
Also do a lot of large cabinets with a 10 slot rack and 2 or 3 starters, and room for customer suppplied equipment.
Largest is two cabinets each with a 10-slot. Maybe a couple a year.
We could probably get away with the two smaller models, they have comprised 90%+ on our work for several years. About all that changes is the program and wire numbers.
regards.....casey