i couldn't put up with the worry of where he/she is and will he/she not come home.
It's a constant adrenaline surge!
But seriously, that's just one of the reasons why, in some countries, the 'indoors-only' cat phenomenon is so prevalent. Personally I don't think it'd be tolerated by many/most 'normal' (ie non-pedigree) cats here in the UK, but if they've been bred for several generations as indoor cats only, those that are desperate to escape at any cost will do so and the ones that remain and get bred from are probably OK with only being indoors as long as they never get a taste for 'real life'.
When I lived in the Middle East, the Westerners compound was divided almost into two halves - Europeans who generally let their cats out, and Americans who generally kept their cats in (until they escaped ...).
My Tiger was just such an escapee; he moved in with me after leaving his original 'owner' who had lavished love, care and attention on him, had him vaccinated, neutered, etc etc. He simply would not go back to her; outdoors he would purr and wind himself round her legs but he would not let her pick him up or even attempt to pick him up - although I could pick him up, swing him about and generally fool around with him! He came back to the UK with me, immediately claimed a place on my mother's lap after his quarantine was over and rarely went out because he didn't like the cold and wet - but he'd check daily whether or not I was going to let him out. I think if I'd've refused, he'd have planned an escape ...
Elsewhere in the MIddle East, there was a dump nearby which was full of feral cats and kittens; a neighbour of mine (I didn't live on a compound there) caught one of the half-grown kittens and tied it up to a tree by a rope. One of their children picked it up by its tail and pulled half its tail-skin off ... A night-time rescue operation was carried out and I, together with a Phillipino midwife and a Canadian orthopedic surgeon - cat lovers all! - laid plastic sheets down on the white shag-pile carpet in my dining room (who ever heard of such a STUPID flooring in a hot desert?) and carried out surgery on my dining room table, with a comparative anatomy book at hand for reference! Well, there were no accessible vets at that time. The three of us ended up castrating most of the males on the dump but spaying was beyond us. That first one - the one with the flayed tail - ended up bringing me regular 'gifts' of big dead rats ... LOL! He was a good boy, though - they were always well and truly dead!