And yet you are addressing the "Law of Biogenesis". If it is not a scientific law, then what law is it?
It's a colloquial phrase, like Murphy's Law.
It's certainly a general rule, but not mathematically defined like scientific laws are required to be.
Yet no one has observed this macroevolution as it occurs over time. Having it occur outside of human observation as beyond human history is a bit of an inconvenience in taking it as a fact. So you are actually citing an assumption about a phenomenon that has never been observed nor proven. That is not real science nor does it qualify as a valid scientific theory.
I think you misunderstand how observation works in the scientific context. The evidence for deep time and macroevolution is repeatedly observational and predictable.
My personal favourite was the discovery of Tiktaalik roseae, a hypothetical transitional fossil that was discovered by searching the right kind of environment in the right kind age range.
To use your definition of observation would you say it's unreasonable to assume Pluto will orbit the Sun? It has never been observed to orbit the whole way around, but with our knowledge of physics and orbital mechanics we can predict that it will. Evolution works on the same principles.
Have you ever heard of Time's Arrow in regards to that Second Law of Thermodynamics? That is the application for how a created system is breaking down and not just energy wise for why things are not becoming more complex, but in the reverse as in breaking down or deformity.
Not actually true as a general rule.
An easy example is the formation of crystalline structures. Warm liquid water in clouds has more thermodynamic variation with freezing air than snow flakes, but much less complexity.
From an energy perspective ice in cold airhas more entropy than water.
Science has made the discovery that the speed of light is slowing down. So I see what you are saying, but the effects on the created system can also be seen as Time's Arrow which disproves the progress of the evolution theory of simple life forms becoming more complex when it is going in the other direction.
Ultimately all energy in a closed system will achieve equilibrium, but that doesn't mean that it is impossible for energy to move around into peaks... even if every stage is ultimately losing some of the total energy variation.
You haven't demonstrated that life increasing in complexity is a violation of thermodynamics any more than reproduction and refrigeration.
edit:
Also, can you demonstrate how the speed of light is slowing down? I've never heard of that evidence.
And wouldn't that be an even bigger problem for Young Earth ideas?