I suppose I could, but there's not really anywhere... fitting to place it. To be noticed, it would have to be closer to the top, but that would also be where the important information goes (like what tiers can recycle what items). A line like "must be researched before use" would feel a little out of place, or shoehorned into the intro section.
I don't think any other mods (bobs, angels, industrial revolution, etc) specify that their machines have to be researched before being used. That seems like something that could just be assumed, especially when the Information tab prominently mentions the 4 tiers of machines. There wouldn't be a need for tiers if they weren't locked behind research, after all.