Preservation classes

Some martial arts classes serve to preserve and safeguard an art that would otherwise die out.
Swordsmanship, archery and other such practices have little purpose in modern life.
The students who train these arts keep the knowledge safe.
They preserve the heritage.

Are these viable martial arts classes?

On the one hand they are; the skills are genuine martial skills, no doubt proven in actual combat over many years.
On the other hand the skills are not functional or viable in modern society.
Will you be carrying a sword?
If you did carry a sword, are you legally allowed to use it?