[Vecr]

There's good evidence for it, inferred temperature of the early universe included. Obviously not perfect evidence, but even if you assume "tired light", it's another thing all together to come up with a new version of thermodynamics.

[miramba]

Indeed. But keyword is „inferred“, assuming that all laws worked the same at any point in a gigantic timeframe, at any point in a gigantic universe. Except singularities. And quantum mechanics as it seems? And maybe dark energy. Oh and lately, maybe gravity waves. Btw I was once in a lecture room in Berlin where they claimed that one of the thermodynamic laws where discovered…while giving a lecture. Not too long ago, perhaps 150-200 years. Doesn‘t seem so unlikely that somebody comes up with a new version at some point.