What is essential may also be defined by local circonstances. I always provide toilet paper, but my guests do not always return the favor. This poor host sometimes arrived back home at midnight, recovered the guest's key, set down the bags, checked the apartment: walls still standing after six weeks rent, check, used sheets in the bathroom to wash the next day, check, no flooding, check, nothing burned, check, no toilet paper - hah, look again: no toilet paper. No paper tissue either. No paper towel either. Lucky me, that's no catastrophe in Paris, 5 minutes walk and I'll find an open grocery store somewhere 😉
Wifi is pretty important, but on the seaside, where the season is 12 weeks only, it may not be interesting to pay the phone line 52 weeks to get wifi in Summer. There are still a lot of listings without wifi, at a lower price. Those hosts may provide information where to find a free access or buy a 5 Euro phone card for data.
That"s everyones choice, what is considered important.
On the other hand, on the seaside, shampoos are not enough, conditioners are essential for women with long hair and sun lotion makes guests happy.