This is a dead issue. And silly, egotistical, take your pick. My audio legacy? Who am I, Saul Marantz? Yes, I have bought and sold, enjoyed and loved, a goodly number of audio products over my lifetime. But I fail to see where that can be seen as a legacy.
If you're talking about heirs recovering value from or actually using these things, well, great if it happens. It's all on them. If my wife goes first, they'll have a house legacy to deal with when I die and maybe a car legacy or two.
Then there's the snow shovel legacy and computer legacy and and my tea kettle and my hand made dining room set and photos and clothes and tools and the rental properties and the dog if he outlives me and so on and so forth.
Bottom line is: your audio legacy, much as it means to you, is just stuff. Your survivors are going to be much more concerned about missing you than any of the crap you obsessed about while living.
Try to picture your grandson trading your Modwright preamp away for a slightly used Gen 6 I-Pad.