I use a towel once before i wash it. I dry my bootyhole with it im not gonna reuse that and rub it on my face no matter how thoroughly ive scrubbed it. All you need is 7 cheap towels and do laundry once a week.
Bedding depends, but on average like every 2-3 weeks.
So i actually saw a video about this recently. Apparently since japan didnt have like any obvious sources to mine iron ore they had to take a bit of an unorthodox approach and collect iron rich sand from streams and waterways. This Iron was more pure than typical Ore but much harder to work with, and form into tools. So their techniques developed differently. Obviously its all the same elements in use at the end of the day. There is a bit of a difference in the way its worked though, and because of that if not made properly the blades can break kind of easily, and when made with proper technique can also be really strong and high quality. So ya basically its both and neither at the same time. Other places also have cheap blades and really nice ones. Just japan gets hyper focused on by certain groups of people.
Also a western sword is an entirely different weapon. Like we see them all as swords but a Katana is something most people can easily pick up while a western sword was like the size of a grown man and very heavy. Because of this western swords just didnt need to be that sharp. The power behind the swing was enough to cut even with a dullish blade. A Katana was more focused on sharpness since its much smaller and didnt have as much weight behind its swings.
In general tho even in japan spears, bows, etc were much more widely used in ancient warfare anyway lol. Swords just became like an iconic thing due to fantasy.