Coins/gold/money is actually planned
It will be part of a future trader/merchant update. Currently I tend to have a separate wallet for it, so coins won't go into a regular inventory slot (but it's not 100% certain yet).
But coins will not be craftable, you will only be able to obtain them by trading (or when looting chests or bandits, for example).
Yes, that's true. There are a few items that cannot be crafted (e.g. most swords), but more are definitely in the works. Unfortunately only very few new items will make it into the POI update, but more will come
Mabye we could also remove a few items from the crafting menu... not sure about this, but for example, items like the toolbelt or grappling gun could be removed, so they would only be obtainable from dungeons or traders?
The toolbelt would be a huge downside, i think.
The grabbling hook though is another level. I even suggest that the curcuit boards (i.e. for drills and metal detectors) are only obtainable from dungeons or traders. It is hard to believe we craft them on our own - even with a modern workbench. Maybe with a very small percentage the recipe for those boards can be obtained in the lootbox of dungeon containers?