OP exactly right. Defining gender being done by methods further and further from the criteria we all used to use.
Very interesting topic given recent events.
However....
Is this necessarily bad? Having only one division in which to compete will turn sport, for the first time since the earliest competitions, into a pure meritocracy. Being forced to compete with an ever-quickening field has always prompted superior performances.
1900. To suceed now, you had to compete with people who actually trained. The 'amateur gentlemen' division ceased to exist. Was it 'fair' that this bloke, even if your genetic peer, was running 20 miles a week?
2000. To suceed now at 3k or longer, one had to beat East Africans. Some say their genetics are superior to all other varieties of mankind, at least for distance running. Unfair? Do you deserve your own division? That would fair, wouldn't it?
BTW, ditto West African genetics at 1/4 mile and down.
2100. To suceed now, you must compete with and compare favorably with males. Unfair? Want your own division?
Facing increasing and seeingly overwhelming competition is the only way any given group or individual has ever acheived performances thought impossible immediately prior. Top American males today run faster than the great Henry Rono, thought to be untouchable at his prime. If absolutely nobody could run 13 flat when I was a teenager, how is it that Ritz and Rupp can and not be huge international superstars? They may have only run 14 decades ago. Somehow, having Haile and Kenny, the actual huge international superstars, 30 seconds ahead of you makes the old WR record seem somewhat mundane.
The great Jonny Walker once said that if the record was 3:47 he'd have run 3:46. Since the record was 3:51 he ran 3:49. I cannot explain why this is the case, but being 10 minutes behind someone can allow you to run 5 minutes faster than what was once supposedly your absolute fastest possible. You wonder why there is now uproar over women running with men? Everbody except the record holders themselves says that it makes you miraculously faster than being at the head of an all female race. I'm not sure what is true, but the IAAF is convinced of this as are the organizors of Boston, Ny, and the holder of every all-women's record.
Having to get first overall to win a race may somehow cause women's performanes to equal men's. We have seen this happen with different groups of men. It took men as a whole a while to get from 2:15 to 2:04 but against all adds it did happen. Can the same thing happen with women? What if it did, or they couldn't taste fame and financial success? Would it then?