I was a SAHM for 12 years, absolutely loved it, we had a comfortable lifestyle with no financial worries and I never felt 'judged' by anyone.
However I absolutely made sure I paid my NI contributions and was well aware that if my marriage broke up I would be in a difficult position. I did return to the job market and although I found a job that I love - it doesn't pay anything like the salary I earned before.
With hindsight, it was not a good decision to be a SAHM for economic reasons.