I think "security" is used as a crutch and an excuse too much.

As a retro hardware enthusiast, very often the hardware isn't insecure. It's just that someone somewhere got lazy or greedy or both and decided to do something that makes the hardware not work right anymore. Things like billion-dollar game companies that shut down servers that cost them all of $5,000 a year to run. It's less than is spent on a single coffee maker, but the company decides to cut off all of its existing customers because they only number in the hundreds, not the millions.

As to "security" — Keeping financial records on a 1982 TRS-80 is far more secure than keeping them on any modern laptop.