Amateur vs pro
Yesterday, If I was a pro, I would have done my scheduled workout outside sometime over several hours in the middle of the day. I’d be living somewhere with good quiet roads with some climbs. It would have been a great workout and I’d be doing some version of that day after day.
Reality - Yesterday I had to work a bit too late to make the 6:00 group ride and last evening was my only window to to get the lawn mowed this week based on travel and a predicted stretch of rain coming. By the time I was able to get going on a work out, it was 7:45 pm. I could have put the lights on the bike but instead hit the trainer for an hour. I got a great workout in (but it was not a pro level workout).
The trainer is awesome. I love it and use it often - but if I was a pro - yesterday would have gotten me fired. And, if not yesterday for sure I’d get fired today after I hit the trainer again to to avoid some rain showers. I spend a lot of time on the trainer 
But camping out on it all the time is definitely not “pro.”