Quote from XSMA
I barely come on here, so I'm not sure if this has been brought up before, but hear me out here.
What if we could have tameable spiders, but with the catch that you could only tame one as a baby, not an adult?
This would require spiders to be able to breed of course(Why can't hostile mobs breed anyway, undead ones non withstanding), which is not in game, but figuratively speaking, adult spiders would not be able to be tamed. They're aleady neutral/aggressive, however, under the rare chance that two spiders breed, which would be VERY rare since I rarely ever see two non hostile spiders next to each other, they'd produce a baby spider.
This is where I get my idea from. In Pikmin 2, you could encounter an enemy called a Bulbmin. They're a mixture of Bulborbs, the main enemy of the series, and a parasitic form of Pikmin, the main creature. Once you kill the adult Bulbmin, the babies scramble around until you tame them with your whistle.
For Minecraft, this would mean killing the adults and then somehow taming the baby Spider; not sure how. Once tamed, it would act like a completely neutral spider, but you'd be able to make it follow you around and equip it with a saddle, which would give saddles a second use besides just using them on pigs. Saddled spiders would be able to climb walls with you on their back, but they wouldn't attack mobs.
It's a weird idea I know, but just an idea.
First off, hostile mobs can't breed because they are generally too busy making evil plans on how to kill you or actually putting these plans into action to have time to make babies.
If you could tame spiders, they would just be that much less scary. They are monsters, they spawn at night, they are here to kill you.