What I see as one of the really glaring problems with all "tired light" hypotheses is that they fail to predict the way supernovae are observed to have their early development slowed down by exactly the same amount as their spectrum is shifted, which matches relativistic red shift's predictions perfectly and is in direct contrast to what "tired light" predicts, which is a redshift, but no slow-down.
Quite simply put, "tired light" is observably wrong.
Reductionist and proud of it.
Being ignorant is not so much a shame, as being unwilling to learn. Benjamin Franklin
Chase after the truth like all hell and you'll free yourself, even though you never touch its coat tails. Clarence Darrow
A person who won't read has no advantage over one who can't read. Mark Twain