I know a bit about the welding industry and and it’s a lack of education, macho attitude, bad habit “I know by smell/touch/sound that it’s going well” and of course management not making it mandatory. Working with respirator is not the fun part of the day, for sure. And mask/gloves slows you down. But well being able to breathe and see at the end the day without the worst sunburn of your live helps ;)