I'm going to break this down for you really simply

You got useful input on the first page.

1. If you break a lot of chains on a ss mtb it's your fault not the chains'.
2. You aren't strong enough to stretch chains quickly. Strength plays only a minor roll in chain stretch.

You then continued to argue that you were "really strong" and tried to impress your strength on us by saying you're not just riding around the city you're going to be on fast road rides holding on with the 2/3s. You continued to insist you don't need something that's going to stretch out after a couple of hard rides.

1. 2/3 roadies aren't usually that strong and you probably aren't either.
2. NO ****ING CHAIN IS GOING TO STRETCH OUT AFTER A FEW RIDES unless perhaps those rides are 1000k brevets or something.
3. Riding around the city is probably more likely to break a chain than a fast group ride. Standing starts are where the most force is applied to the chain not constant speeds in the high twenties or jumping from 28-38. Not to mention skidding to a stop which if you're doing on fast club/group rides is going to make you very unpopular.

Don't be an ass:
1. Don't assume you are stronger than the people giving you advice unless you have strong evidence to back it up. Winning chariot races against 2/3 track sprinters would qualify.... hanging with 2/3 roadies on a group ride doesn't.
2. Pointing out non-humorous spelling/grammar errors on a message board is only one step above threatening to quit.