If your present setup meets your needs, why change? The only reason that I can think of would be a situation in which updated apps, websites etc. will no longer work for you because your system is outdated.
FWIW, I refuse to get a cell phone. Both my wife and I are retired, we're home together most of the time, and neither of us wants to bother. If I ever do, it will not be from a company that requires a contract or has a termination fee. Besides, I like being out of touch when I'm away from home.
Jon
macOS 11.7.10, iMac Retina 5K 27-inch, late 2014, 3.5 GHz Intel Core i5, 1 TB fusion drive, 16 GB RAM, Epson SureColor P600, Photoshop CC, Lightroom CC, MS Office 365
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