Always good to see two of my interests intersecting :D
Anyway yeah I love playing older games and low-hardware-requirements games. I find that they're also generally more accessible because of that.
And there's far more games than anyone will ever play in a lifetime. Not even all the games one wants to play.
There are maybe some concerns that older hardware does use more electricity, but that's probably more than made up by not buying new devices, unless you're using them very heavily.