gosh, long post written but disappeared - ! yikes!
you never know what the future brings (if you do, please give me lottery numbers!!)
it's good to expand 'comfort zone' a bit!
it's not 'all or nothing' - I've had times where I wished to be alone more, or more with people - depends what kind of people they are too!!
And what kind of activities - I hate 'socializing' for 'socializing sake' - there has to be a good reason behind it (eg good music and dancing, social networking/expanding network of useful contacts, good food

, doing good work - eco/creative projects, volunteering, helping people, learning on workshops or courses etc)
I also admire some older members who have found a good BALANCE for them!!
Just staying indoors/behind computer all day = not so healthy...
As for living 'on other people's taxes'... most people didn't really start their life thinking 'oh I wish to live off other people's paychecks'... or 'when I grow up I want to be on social support' - where I live there is little career coaching/support available, education in schools often doesn't prepare people for 'the real world'... and since world population has grown, technology expanded, there is less need for 'workers'...
Social support may cost the country/taxpayers much less than some bad decisions of people who 'work'!!
Where I live a new law says people will need to 'pay back' with their real estate anyway!!
Some 'hikikomoris' or recluses have earnt a lot of money, some maybe need to find out HOW!!