I'm just going to go out on a limb here and assume you're a product manager for atlassian.
Nit: TCP doesn't handle TTL, IP does.
These deals are made by people who don't use the software because they passed some checklist of features and security audits, not because they are good.
Consumer websites, blogs, and especially eCommerce websites can't get away with that without losing users almost instantly.
The moral of the story is that if you are already a big, wealthy company with a big reputation, you can afford to be shit. If you aren't, you're making a big mistake with 3-4 sec load times.