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Russia says nothing about goals, and what they would consider as a baseline for peace talks. Well there are certain things that had been said by certain people (like Prigozhin) but no official statements. For the exact reason what you wrote.
But Ukraine - on all levels and the Western supporters too - is very vocal about what they want. It is a very different situation with them because of that. They don't just shut up, or just say they have to fight against the invaders. They are loud and clear about goals. And this can have grave and long lasting consequences if they don't accomplish that goal. Yeah, there would be enormous amount of cope like how they did with Mariupol (the defenders were "evacuated"...), and it would be pushed everywhere, but it would sour many, many Ukrainians, and in the supporting countries lot of people would reconsider their views, might be even governments and could lead to deteriorating in international relationships, with the US for example.
Furthermore on the basis of this rhetoric they bully nations to sponsor the war (because it's not supporting anymore), and based on this rhetoric some politicians want to introduce sanctions against Hungary for example.