My take is that in a representative democracy we should strive to make it possible for people who get elected to be ... erm representative. And if the job is set up so that it excludes people wanting to live 'normal' lives then we are excluding normal.
A lot of the changes in how the idea of representation has been ti extend that. So paying MPs as the Chartists campaigned for was all about ensuring that people from different backgrounds, and situations could choose to run for election, and thinking about how parents of young children can do that seems related to me. As already mentioned there have been a number of reforms in Westminster, many introduced by thd Blair govt, to make it more supportive of 'nornal' life, and unless you think that was wrong, taking a position that further reforms might be beneficial is just hypocritical.
And I want people involved who think they can do a good job, not just because they are willing to 'serve' or give up a 'normal' life, else we are not just losing representation, we are making it elitist and based around an idea of service that isn't for me a beneficial one. I note that Prof D selects two MPs who should not be thanked, and that both of them went to Eton, and I would suggest too much of the approach of give up any chance of a normal life flips the system to people whose idea of public service is based around that approach.
Being an MP, MSP, and others is if you do it right a brutally hard job which is badly rewarded in comparison to what many who might consider standing can make so it's encouraged people who are either already rich or want to abuse the job to do it.