Rayner's experience will help her in connecting to and appealing to much more real life voters.
The sort of underpaid, overworked, undervalued key workers the country is now patronisingky clapping once a week. Nurses, carers, social workers, cleaners, caretakers, low level admin and clerical workers, hgv drivers, warehouse workers, shelgmf-stackers, refuse collectors etc...
She's probably the first average, regular person in a high up level in politics for absolute years, probably decades.