Is there a need for them?
I just consider the later point releases as respins of existing installs with only updates applied so fewer updates are required for new installs.
Ubuntu release announcements include text that says
As usual, this point release includes many updates and updated installation media has been provided so that fewer updates will need to be downloaded after installation.
Sure, I'm using that quote as its something I'm very familiar with (I'm the Ubuntu News member who has posted most of these since 2017), but the text is consistent across most announcements as they're all made from a standard/official text.
I also posted something on this site
which included a link to what @ironfoot referenced.
For .2 & later media there is a rather significant change; in that the flavors like Ubuntu-MATE switch from installing with the GA kernel stack, to HWE; which means each of the .2 & later ISOs will have different kernels, but even that's predictable, given its been the same for a decade+.
I personally don't see a need, but that's only my 2c.