They are not obsolete in my shop. I have three in service all set up with different wheels for what ever I need. For other needs, I use the angle grinders (3) 4 1/2 in. a 7 in and another 9 in. set up with different wheels grinding, cut off, flap. I also have a large sandstone powered wet grinder for finish work. Gee, it looks like I'm lazy and don't want to change wheels very often. Not to mention a large selection of hand files.