I understand that in your view an ideal evolutionary accomplishment would be to have a complete and defined set of genes and features, but in reality evolution (or more specifically in this case, natural selection) feeds on the balance between the stability and instability of the genome. The inherent plasticity of each genome is the only way to adapt and evolve.

Genetic evolution is not only mutation and not all mutations are bad. Of course the evolution (or change) by means of mutations in human is obscured by other phenomena such as drift, assortative matings, among others. And for a Plasmodium mutation is not the only way they can evolve and survive. The same factors that drive “ours”, drive theirs. “like a body that can bend, a muscle that can grow larger” which are in most cases defined by the genotype.

You can only fight the environment with the tools the genome has given you.

PS: Os nomes de especies, mesmo as mais conhecidas (E. coli, etc) seguem um padrao de nomenclatura o qual requer que o genero seja escrito iniciando-se com letra maiuscula. Usualmente nomes de especies devem ser em italicos tambem, mas esse e uma norma que pode nao ser respeitada para o caso de algumas especies, e em discussoes mais informais.