I do not know what the case is on all forms, but from more modern registrations, such as for the production company behind The Grand Tour, W Chump and Sons [1], at least for adding directors, residential addresses are hidden away. Additionally, I would love to see any credible examples of abuse from this system, seeing as it has been around for a while.
Yes, quite recently they've started to allow more care about disclosing the details. There is still more than there really needs to be, but not as much as there used to be. But of course the historical filings are all still there.
There is typically no way to provide credible examples of specific abuses of this information. Then again, after 1,000,000 people's details leak from a financial organisation being hacked, there is typically no way to prove beyond reasonable doubt that the wave of identity thefts that follows was a direct result of the leak. That's not much comfort if you're on the receiving end of it, though.
[1]: https://beta.companieshouse.gov.uk/company/09668527/filing-h...