I am not tossing out any valid data points. The losses are indeed significant. Look at the post I was directly replying to that implied that maintaining what is happening now is going to force Russia to withdraw anytime soon because they can't sustain further losses or deal with low morale. That's not how things look from where I'm sitting. I'm free reply to speculations with my own. Maybe the tide will change. I don't know. I am just not convinced yet.
Anyone thinking anything if going to change 'any time soon' is overly optimistic, but on a grand strategy level I don't see any way for Russia to win in the long term. As long as Ukrainian national identity and will to fight remains, Russia can not win with the resources they have allocated to the fight(or that they CAN realistically allocate to the fight).
Territorial losses that do not impact warfighting capability are not really relevant to a fabian strategy like Ukraine is pursuing. I don't know (and neither does any other civilian in the west probably) enough about the on the ground tactical situation to know which Ukrainian territorial losses are relevant to their warfighting capability, but you can expect it to be proportional to how hard they fought to keep it. So Mariupol and Severodonetsk were likely substantial defeats in some way or other, but maybe not when compared to the costs imposed on the enemy. All of the minor towns they walk away from without a fight you can expect are strategically irrelevant.
The important metrics for a fabian strategy are the ones dealing with whether the ability to fight remains intact and operational. Sortie rate, enemy casualties, etc. Ukraine has managed to keep those metrics relatively stable from the beginning, but so far has been unable to substantially increase the pace. I suspect a lot of this is due to the logistical issues causes by the switch from soviet to NATO weapons systems, which negates some of the build out of the armed forces that has happened.
Anyone who thought because Ukraine stopped the decapitation blow at the start of the war that the war wouldn't be a bloody mess or that Ukraine would be able to push Russia out of the country in a matter of months was insanely optimistic. It will take years for Ukraine to build up the capability to push Russia out, even with continuing international support.
Now will Russia decide that it's not worth the cost eventually and withdraw without being pushed out? IMO Russia is already in that position strategically, even assuming they capture and hold all of SE ukraine and put down all the insurgency and the entire area returns to pre-war economic output(impossible), it will take centuries for Russia to recoup just the direct military costs from this war. If you add in the sanctions and international isolation and the demographic costs, I see no way this doesn't end up as a massive strategic loss, even if they hold the territory without further costs. Putin is all in on this war though, so I don't see it happening with him in charge.