mainstream politicians, of all sides, don’t understand the concerns and privations of everyday life
This is the answer to your title assertion — voter’s aren’t divorced from politics, its that politicians are divorced from voters. It is a concern that politicians are not representative of ordinary people (and this drives the disconnect) but in the larger parties the selection of people who have not held any real job starts at the lowest level of authority. This is where SNP managed to break through and offer a breath of fresh air as they have politicians of conviction who have lived the lives of ordinary people.
The other issue is that politics rests on a foundation of inequality where those with the largest pockets go much further, leading to bias before anyone has even cast a vote. Where Labour candidates (as an example) can spend £24K on a constituency yet independents (who may be some of these ‘working class’ candidates) can’t afford to pay for a ‘free-post’ leaflet or minority parties struggle to find the cash to pay for a deposit consistently across the UK — the ideal as highlighted later on in your article:
voters should be able to look at parliament and see a Commons that resembles them and their friends, not an elite.
Will never be achieved. Sir Christopher Kelly calculated it would cost us less than we pay for our monarchy to have a fair state funded democracy and we need it now more than ever.