outmoded
No longer used because something newer and better replaced it.
Outmoded means no longer useful, practical, or fashionable because something better has replaced it. When a technology or method becomes outmoded, people have moved on to newer, more effective alternatives.
Typewriters became outmoded when computers arrived, offering easier editing and printing. Cassette tapes became outmoded when CDs provided better sound quality and made it easier to skip to your favorite song. Each generation sees certain tools and technologies become outmoded as innovation marches forward.
The word applies beyond just technology. Teaching methods can become outmoded when research reveals better approaches. Fashion styles become outmoded when new trends emerge. A factory using outmoded equipment might struggle to compete with companies using modern machinery.
Outmoded carries a neutral observation rather than harsh criticism. It simply recognizes that what worked well in one era may not suit current needs. A rotary phone isn't bad, it's just outmoded. The Pony Express was an impressive achievement that became outmoded when the telegraph arrived.
Notice the difference between outmoded and outdated: something outdated contains old information (like a 2015 map), while something outmoded has been surpassed by better alternatives (like using a paper map instead of GPS). Both suggest the need for an update, but outmoded implies the entire approach has been replaced.