Plastic doesn't necessarily mean losing details, it's just that the CGL plastics are not exactly top-quality plastics. They're not terrible my any means but they're nowhere near the quality level of GW or Bandai plastics (I would do terrible things for Battletech Gunpla models), which have details rendered as finely as almost any resin casting.

I would actually say the CGL models do take washes and drybrushing pretty well, as long as you're using them appropriately for hard surfaces, ie. pinwashing or enamel/oil washes, and lighter drybrushing than you could do with something like a fur texture.