Foreigners living in the UK with UK BRP and BRC physical cards will find that their cards expire on 31 Dec 2024. Those physical cards are being replaced with UK eVisa.
The problem with the UK eVisa is that there is no certificate or document you can download to prove that you are a UK resident. Instead you have to go online to a gov.uk webpage and generate a temporary share code that is valid for 90 days. The share code can be used by employers or landlords to confirm that you have the right to live and work in the UK. They would take the share code and enter it in another gov.uk page and confirm the the foreigner's immigration status.
But this does not help while applying for visas to other countries. As an example, consider document required for Japan eVisa for tourism. A required document is:
Document to prove legal residency (e.g. residence certificate, residence permit, driver's license)
Now not everyone has a driver's license. BRP was the "residence certificate" or "residence permit". With BRP going away, what are we supposed to submit as "residence certificate" or "residence permit"? Surely a short-term share code cannot be a "certificate" or "permit".
I chose Japan only as an example but one can imagine many other visa applications would require a proof of current residency status in the UK. How are we supposed to prove our UK residency status when there is no document available to help with it?