Why nextstrain does not have a bootstrap option in the tree building step?

I believe the virus diversity is too low for the bootstrap assessment to give reliable values. Therefore, you evaluated the benefit/cost ratio of using this procedure in the pipeline, and decided to not incorporate it to the pipeline. Is it the underlying idea behind the protocol, @james @jlhudd @rneher?
I just need this confirmation, because a referee asked about the support values of the clades of my phylogenetic tree.

Thanks in advance.