Sorry, I'm late, I was making the popcorn and had to go to the store for some butter.
And where do you draw the line anyway? Amps have EQ sections... Is it ok to use the amp eq, but not an eq pedal? What about amp distortion or compression? Surely, if pedals are a crutch then so are amps, and we should all plug straight into the desk?
There was a period where there was no such thing as effects for electric guitars or basses. So, the line might be drawn there if one must draw one. Historically, there was no such thing as effects pedals prior to the 1960s.
There were some effects finding their way into guitar amps, tremelo and spring reverb. I've even seen vintage Gibson amps with a one knob compressor. Outboard reverbs (some with tremelo) started showing up in the late 1950s, but they were big AC powered boxes with tubes inside. Tape echoes with tubes also became available in that era. I don't know for sure what the first effect
pedal was, but the Gibson/Maestro Fuzztone was probably the first in 1962. The wah came along shortly thereafter and then it was off to the races once EH started to invent pedals that made your amp ten times louder.
We're not in the 60s any more and people are free to use whatever they like for whatever reason they might have. Or not. Whether that's pedals, flats, tort, P, J, short scale, fanned frets, headless, tubes, class D, neodymium, alnico, ceramic, in-ears, analog, digital, active, passive, blah, blah...