Back then, if you were a phreaker, you basically got a few free phone calls. And learned a lot about the telephone system. I think for all intents and purposes you were a rounding error and really weren't doing any major harm (i.e. lowering slightly the profit of huge hulking corporations that were quite well). If you were a classic MIT hacker, you never even entertained criminal activities in the first place. I guess the 2600 culture and the Hacker manifesto is more descendant of phreakers and early internet hackers in the "break into computers" sense. But even then, as it says, "their crime was curiosity", and the purpose still was never to steal stuff. That's what criminals do. If you break things as you learn, you have the responsibility for your breakage. If you harm people that can be real harm. There's a difference between unsanitized (and harmless) and plainly an asshole. You gotta learn the difference.
Honestly I think this point is really important to drive today, because if we had script kiddies a few decades ago, today we can have Uber-Script-Kiddies, probably you can get a hold of some jailbroken LLM model and break serious things without technical knowledge or good intentions. Don't do it, kids.
But overall I don't see how it's worthwhile to actually do this kind of hacking today, specially the more attacking kind. I think there is today so many more resources for learning things non-destructively (although I'm sure there always were some).
The hacker mythos in my opinion is due to the mythos that are always built around power. There were the mythos of warriors, of sorcerers, etc., there was the shadowy ninja, and so many others -- they usually wielded some special skill, power or ability. In the case of hackers, they wielded special control and knowledge of computers to do their bidding. I think this kind of myth would happen regardless of intentions -- to break or to defend. It draws our attention and imagination I guess. Kind of like being a magician in an era dominated by communicating machines.
Naturally, the distinction between wielding those powers for good reasons and bad ones would emerge. That's the black hat and grey/white hats. Side note I think the black=bad, white=good association is just a kind of bad one, and nonetheless extremely overused at this point, but I digress. The thing is, what you do have consequences. If the only consequence is you learning stuff, maybe some minor nuisance to a megacorp (like downloading a e-book you don't plan on buying for <legitimate reasons>), then I think that's the good ole' hacker spirit.
I think the observation and a little bit of daredevil spirit is useful because almost every experiment we do IRL tends to carry at least a little bit of risk. We need to manage this risk wisely. For example, if you're messing with electronics you can run the risk of electrocuting yourself or destroying your device. The right spirit is not don't do it, but learn to do it safely enough, and at an acceptable risk to your device. If you wanted to play with radio transmissions, you run the risk of disrupting communications from emergency services and medical devices. Again, it's not "don't do it", but "know what you're doing". If you're playing with computers, (and you were skilled enough; which most of us (thankfully?) aren't) you can basically unleash a minor disaster. The answer is as always not "don't do it", but "know what you're doing and what you're playing with". Also of course for entrepreneurship as well, it's not "don't do it, never make anything". Everything carries risks. The important thing is to study well enough the risks of what you're doing until you can be reasonably sure (in proportion to the risk) the benefits outweigh the risks. Have integrity. Else yea, don't do it. Don't shove a gazillion ads into my eyeballs until I almost lose my mind, thank you very much.
Hackers are all part of society. That's what Hacking the Planet means in spirit. Use the magic sand to save the world. Wield the beauty of the baud... the mastery of the switch. Or Just learn and have some harmless fun, make someone smile, that might be better than any software or widget you could ever make.