In fact, if you would give me a bag of 50% LEGO (tm) and 50% These exact parts I doubt if I could easily sort them out without a building manual.
But in a way this was sometimes also true of the genuine article all those years back.
The fit to normal LEGO was acceptable, although the alignment is not optimal.
There was a little shaving and cramping on both ends, but visually the elements seemed to match and it wasn't very hard to combine parts in various manners.
Whether it's the wheel of the ship, or just how a few block should be arranged.
This breaks a little from the ideology "Gather your tools first, count them, then build" but it does add a little to the clarity and ease of it all.