Why can't house spiders go out into nature like outside spiders?

Ever heard of symbiosis? Even germs are that way. They are in you whether you like it or not.

Yet we've created an environment that they have adapted to that benefits them for thousands of years. Just like the germs in us that we are all hosts to.

Here in Australia outside spiders are large enough to reach the door handle.

They will melt in the sun

They're home naturists

Cold

Better environment, safe place and easy food (insects). It's like heaven to them.