[hattend]

So pressuring the cockpit to the level of a lower altitude eliminates a lot of stressful aspects of each flight (like breathing pure oxygen).

These pilots are in spacesuits. They breathe pure oxygen to purge their bodies of nitrogen.

Even if they pump the cockpits up in pressure (not even sure the structure could handle it) the pilots would still have to be in the suit, breathing O2, in case the pressurization fails at 70K+ feet.

Or am I just using faulty logic?

[U-238]

Your right. But those suits are great. They are heavy though to wear.