You have misunderstood - the point about the £80k equity partner is that he owns a share of the business, i.e. he doesn't draw a salary at all, his take-home is based on doing enough legal work to pay all his staff salaries and other overheads (office, licences for legal research tools, business rates, PI insurance) whilst risking his own capital. I estimate that £80k is probably the very top of the tree for a high street solicitor, and most will earn less.
I wouldn't risk my house for a middle management salary of £80k, but next time we want to divorce, settle a dispute our purchase a house, we should all be grateful that some solicitors do. They are certainly not "paid too much" as your pp stated.
Focusing on the city pay of £1m plus better supports your argument, but no EP is getting paid that unless they are bringing in business to the firm of many multiples of that value (and the minute that stops, they are unceremoniously removed). Equally, I don't believe that any NQ is worth £150k, although they are worked like donkeys and I have seen more than one young lawyer absolutely crack under the strain of being available 24/7/365 and sleeping in a pod in the office night after night.
It's true that I pay my cleaner well, because she is reliable and trustworthy, and I depend on her. However, I do not think it's remotely reasonable for a role requiring 6 years training and studying to a professional level to be paid the same as a role requiring no skills or qualifications. We cannot all be cleaners, but what is the incentive not to do a simple, manual job, with our working time directive rights intact, when there are no material benefits associated with a challenging an high-risk one?