How have instructions changed?
Get an owners manual for a 50’s or older car. They not only tell you all operating and maintenance stuff, they would tell you how to shift the 3 on the tree and drive the car. The FSM’s are much more in depth.
Do you know what a “Sears House” is? Sears would sell a package with everything to build a house, with full instructions, and people that were not professional contractors or construction workers could build them.
Are you familiar with the old Heath Kits electronics? Same thing. The directions were so good that a non-electronic tech person could build a nice stereo, or a color TV, from a box of parts.
Just saying, if the instructions are complete and well written, it’s on the end user if things go sideways. However, if the instructions are poorly written or missing, that’s on the folks making the product.