Earlier quoted context omitted.
Go work for some bigco that is coasting on a great market position of a SaaS project and you can definitely find software jobs where you can work about 30hrs a week, make around 130-180k a year, and chill hard. Only problem is that after a while you'll get really complacent and your skills may suffer. If there are layoffs and you have to find another job, you might be in trouble.
You shouldn't worry about falling out of the technology rat race. Everyone's stack is different, you would be lucky to time learning a technology with a particular job opportunity that is using it. You may as well just research it the weekend before the interview and be upfront about your ability to learn it. You can't know every technology and in 5 years you will probably be applying for jobs with tech that doesn't…
However, if you are an internally motivated and driven person, you can take that extra time and energy you get from the chill job and learn all kinds of things and become a much better engineer. The situation is whatever you make of it.