Not sure if even that's a real change. Since a new party president with their congress can change the law again. The only way to do this correctly is with bi-partisan support which seems to be lacking on more and more issues these days.

This is true. But bi-partisanship appears to be dead now. So the closest we have is a trifecta government passing something and then hoping there is a long enough time until the opposing party gets a trifecta so that the change sticks.

Look at the ACA. It's been around long enough now that so far most attempts by the other party have failed to overturn it. But you're right, it's still under attack. So we shall see.

Laws that give out free stuff are especially sticky.

I don't think it's a bad thing that the will of the voters can lead to changes in law.

I don't think that's what is being claimed to be the issue there. More that the minority party will often resist, challenge, filibuster legislation, even if it is for the good of the country, for no other reason than "we are the opposition". There are many things that might be objected to on philosophical grounds, but during Obama's term, McConnell literally was quoted as saying his goal was for Obama to be unable to pass any legislation, regardless of the good it would do.

Case in point: Senate Democrats learned this the hard way with the filibuster. However, I contend that even when there is total unity in the government, real change does not happen. For example, when the republicans held all three we did not see overturning of Roe v. Wade, or any of the doomsday scenarios we were promised. The most that happened under democrat three rule was a deeply flawed health insurance disaster.