Bath towels are not necessary

This time I have guests who are professional AirBnB stayers. Again, they booked #2, but I managed to upgrade them to room #1. The guests were super happy. They are friends, and they were so happy that they each have their own beds. On the day of their check out time, they told me towels are not necessary for guests at AirBnB since they usually bring their own. That is something I was not expected. He told me the house was nice and cozy, and he really likes the alcohol pad I provided for my them and tissue paper. However, towels are not necessay at all because towels are considered personal stuff, and by removing it I can save some time and water washing and drying it! It is really something I learned from the guests. And he is abbsolutely right!