[[Considering the DNA based relationship trees used in modern phylogenetics,]
Which coincidently doesn’t show common descent unless you fill in gaping holes with imaginary scenarios that violate nature, but rather shows discontinuity.
One example of why you are wrong:
117 clades of euagarics
http://www.biology.duke.edu/fungi/mycolab/publications/117clades.html
As homework, learn what parsimony bootstrap analysis mean in this context.