I think that if you would wait to see in the steppe a bear or an squirel, or to see how it grows a fir you will expend all your live...
We already covered this. There are bears on the steppe, and regardless, my entire point is that PIE was formed and spread by northerly R1a and southerly R1b, as evidenced by the breadth of vocabulary (along with, obviously, genetic evidence).
Your argument, in contrast, seems to be "there are many red alarms regarding R1b clades being Indo-European despite all the evidence because I don't want to believe it." None of your "red alarms" have actually been "red alarms."
You are right that Yamnaya had R1b, but a clade not related to the western R1b, and which as you complain with the Basques, don't show up so much variety.
How are one's father and brother unrelated? L23 (found in Yamna), Z2103 (found in Yamna) and L51 (western European) all formed within a few centuries of each other. L23 preceded Z2103 and L51. The latter two are the offspring of the former. Brothers of the same father, to oversimplify, or (more realistically) cousins with the same great-grandfather.
How does one even imagine them to be "unrelated?"
You know that all of us R1b-L51 guys from Europe still carry the L23 mutation, right?
you can row a boat without knowing any sea, ask to the Amazonian tribes.
You can, but there's no reason to believe there were magical walls blocking off the Black and Caspian seas. Unless that's part of your theory...?
"The fact that they had boats, rowing, access to seas and a word for bodies of water that was later used for, as an example, the North Sea, is a red alarm because we all know that steppe-bears can't man an oar in the Black Sea because bears can't live on the steppe!"...? :innocent:
I need a lot of fantasy to believe in it.
Certainly no more than's required to ignore everything that doesn't fit in to your theory already.
How could you explain Yamnaya ancestry in Chalcolithic Iberia? that's not a problem for you?
No, eastern ancestry in ATP3 coupled with R1b, contrary to numerous other local remains, is in no way a problem for me, as it's logical given the premise you're arguing against.