A lot of the to do with modern speakers vs. old is, what you don't know can't hurt you, if you enjoy the old ones the same as you remember. If my vintage speakers had never fell apart, or the pots on my amps gotten ridiculously contaminated, I never would have cared to know better.
Speakers are much better now. Even many of the budget ones are hands down better than the bargain versions of yesterday, and this from someone who is stubborn about technological progress.
OTOH, I can't imagine a more self-enriching hobby for retirement, or free time in general. Great for rainy days and down time too. In this regard, there is a discovery aspect that can lead down many rabbit holes and adventures. With me, it is the building, and then listening to music on what I have made. I now have 11 pairs, 7 of which were kits, so we can add the rebirth of my woodworking hobby, yet again as well. Also dusting off electronics career I started out with, to build amps and speaker crossovers, being as I never did anything else with it otherwise.
Many modern speakers can be a bit too revealing with older, questionable quality recordings though, which is why I have different speakers, some of which that are a bit more forgiving than others. The newer designs and newer playback formats have inspired me to look into and even adopt other genres of music that I would not have dreamed of following in the past and unwittingly got me out of that constant replay rut I had been stuck in for years.