I do like the idea of weight having an impact on some things, but I don't want players who play without it to be left out so I try to keep such things fairly innocuous.
Maybe a ways in the future I'll expand the equipment system with crafting and modifying in such but it's not something I have any plans for at the moment.
The guide has needed a complete do-over for a long time now but I just keep putting it off and I apologize for that.