TL;DR
When handcrafting, highlight the raw ingredient that is limiting how many of that item you can craftWhat ?
When handcrafting a certain item (especially more complex items) The game should highlight the raw material that is limited how many items you can craft, say for example you have200 stone
150 steel plates
100 iron plates
and you attempted to craft rails, you would be able to craft at most 300 (150 crafts) limited by the amount of steel plates you have, so the game should highlight steel plates
200 stone
150 steel plates
100 iron plates
Why ?
When handcrafting in the early to mid game many players (including me) craft in bulk (relatively) large amounts of items, such as belts, inserters, assembly machines, etcbeing able to tell at a glance which items you're lacking before you start crafting is very helpful