I recently found out that Bedbugs are still a thing (I thought they were largely eradicated). I also found out that I'm allergic to them, and While a mosquito will bite once of twice (until it finds blood), these guys leave a line of bites as they move around sampling your blood (my back, neck, and shoulders were covered in welts).

I generally avoid killing/ removing spiders (they also prey on moths, keeping clothes etc hole-free), wasps too to an extent (but they are still largely a pest).

The Bedbugs were quite easily eradicated with insecticide around and under the bed, but that's last a resort as it is toxic to virtually everything (including pets and humans), something I don't doubt as the smell is more irritating than Ammonia. I'd much rather use natural remedies (especially when you don't have to do anything), than strong chemicals that we don't truly understand the effects on the environment or the food chain.