By simpler do you mean easier and more often? Or that in post-internet anything “new” can quickly become “no longer new”.
Post-Internet a lie can travel round the world in nanoseconds before truth can get it's boots on! Their world was barrios, drinking, gambling, and dance. The rest of the world had other concerns. Sure, they 'met' at milongas, but multiple people could probably come up with the same idea, and one claimed it as theirs, and so it passed on as the anecdote.
Tango I don’t think has evolved into a different dance style or gave birth to something other than tango. It has in essence remained the same dance. Vals, Milonga, and Tango have so been present since early days?
Milonga is frequently claimed to be the earliest version of tango. But today's (post 1932) milonga (urbana) differs from early milonga. Canaro claimed to have coined the term 'Tango milonga' as 'Tango for the milonga', or 'tango for dancing'.
Before 1910s, what was danced was precursors to tango.
Yeah, you could define pre-1895 as 'proto-tango', but so what? There's plenty of tango history lessons online. My point is that there are 'phases' of tango in history and some transition, or evolution, to each phase. We pick up and carry forward adaptations of bits of associated culture with each phase (like cortinas, or bits of códigos, adapted for some new phase).
Tango used to be danced in brothels and drinking dens where the men paid for a ticket to dance. The women just got paid for the evening. Probably an improving evolution to have dropped that!
But how do you define a giro/molinette
I don't care (except to execute it). My point is that it got picked up and developed, or evolved. There would have possibly been a time in some barrio practica where some teacher didn't know what Petróleo was doing, or he was from the right barrio. Of course when they found out, and people wanted to do it like him, they taught it.
Maybe I need a new 'killer step' in my dance? Do I develop it from what I know of or invent it? Has someone somewhere got something similar? Wow, you want to copy it?
Does any other dance had something like ganchos
Few. Those that do have stolen it from tango (fusion). But do they have it codified in some specific form?
Consider El Pulpo, known as the 'King of Ganchos'. Do many wish to dance wraps like that? I suspect there are few teachers who know of those ganchos to teach them.
I have vague recollection that the 8CB was also used in days when men first learnt with men. Or my memory is fuzzy.
I'm sure something similar existed, but perhaps not known by that name. Not exactly an Argentine Spanish term!
Paso básico maybe? AI tells me it was developed as a didactic tool for teaching, possibly around the 1950's for international teaching since there's no basic step in Argentine Tango.
Everyone whether a maestro or average social dancer develops or falls into their own style.
I'd say some actively develop it and promote it; the rest just dance (fall into it). That's what separates the 'greats' from the 'also rans'.
My point was simply to illustrate that some teachers just teach 'basics', and that's 'good enough'. There are some elements: the known and unknown unknowns, they can't teach because they don't use them.