You are missing the point. lets say I sell my house when I retire this year (for example) at the age of 67. I need to spend £350k to leave £100k max of savings so actually I need to spend more than that as I have savings already.
I am expected to live until I am I am 81 (14 years). There is a good chance I will need social care for the last 3 years, some maybe home based, some in a care home.
Therefore, I need to pay rent for perhaps 14 years. £350k/14 = £25k per annum or just over £2k per month. I can rent a better house than the one I own for £2k per month. I still have my state pension and private pension coming in on top which would cover the rent anyway so I can live wildly now as no point if my assets are just going to be used for social care costs anyway after my death.