Good stuff. Sitting still for 60-90 minutes has the purpose of eliminating the distractions from paying attention to your body. This practice also has the benefit of hopefully allowing the ego to settle some, and perhaps even allowing the baseline level that the ego is engaged to be less - or start towards that path anyhow. As you said, stress still maintains the same - it actually will feel potentially even more vivid, though that is likely counter-acted with the ability to process things easier. Learning other things, and doing deeper guided meditations and breath work, like yoga nidra - is a good way to lessen that. Physical movement, asanas - or yoga as a whole, meditation being a part of yoga - is a good way to help physically-caused stress and baseline stress reduce; There's a biofeedback mechanism: tight muscles tells your mind you're stressed, you being stressed tells your muscles to be tight. "Nice" little loop there.