A bit related to the initial chat about old version support in https://community.enhance.com/d/11-supported-php-versions, I feel it would be good to signpost, or at least warn customer about using EoL versions.
PHP 5.6 EoL was 31 Dec 2018 (4+ years ago)
PHP 7.4 EoL was 28 Nov 2022
A lot of customers will just select a version to make their site work, often unaware in doing so poses potential issues, instead of resolving the core issue of their site being kept up to date.
Personally, we have set a timeline of end of year to remove it entirely (in cPanel) but this then is confused by the fact we cannot control what versions to (or not) offer in Enhance. This seems to be dictated than controllable.
In the popup when selecting a version, especially those that are officially EoL - i'd prefer to see a fairly clear warning about selecting such a version, highlighting that it has security risks and give the date when support ended.
Maybe even a check box to confirm they understand the risks when doing so.
Having come across a site today from one customer on cPanel running a 13 year old code base, there has to be a time when a host has to force the issue. Software on a website is no different to that on your computer or phone - you should keep it up to date and there will come a time where if you don't, things move on and you will have to and it will be unsupported.
Allowing EoL versions over 4 years after they were supported shouldn't be a thing, by default.