"Whaa, but rice is animal feed!!?"
Always annoys me when apparently the isekai people were too stupid to try eating something themselves. Here in the real world, there are entire recipes and methods for cooking thistles, because people have starved and learned how to do so.
You mean to tell me they never tried boiling the "animal feed" to make it tender? Really?
As for the other isekai'd dude, I see several people thinking they his partner probably felt he ran out on them, but I doubt that. He left all his stuff, probably had a fully untouched bank account, hasn't contacted other family members.
It's still sad for them, because the mystery of what happened is probably more torturous then simply finding out he died.