...and compare it with now the difference is almost imperceptible.
Imperceptible to you.
Your argument that phones without zoom lenses had, 'decent digital zoom and stability (for a phone)' only serves to highlight your inability to perceive the difference having actual optical zoom makes when zooming.
Crazy how one would even make this argument without actual image examples, unless that kind of research only led to realizing one's argument is wrong.
Make sure you're well hydrated (with water), eating healthy and regularly, getting regular exercise and have a good sleep schedule. If those are all solid, talk to your dentist about sleep apnea and if a sleep appliance might be right for you, as you may not be breathing well in your sleep.