It doesn't put a "customized image of some sort" on servers, it literally iterates through installer steps with the autoanswers provided by preseed file.
You might say that it is customized since we wrote a preseed file. Well maybe, but it's not a "customized image". Also we didn't write any specific code to remove unwanted packages. It just doesn't install them. No weird packages like byobu :)
nod I'll go out on a limb and say "I think you may be somewhat in a minority in 2020" as many in my travels have moved over to an image based deployment methodology - it's not absolute and of course I've not been in every company, just the landscape in general. I wasn't aware Canonical had an "online PXE" flavour that you linked, TIL.
I say all this above, but I'm sure there are still shops out there burning ISOs to CDs (maybe USB now!) and hand installing everything - if I've learned anything, it's that nobody seems to agree on how to do stuff the same way. :) Each company is it's own beautiful unique snowflake full of their own design and deployment patterns.
The new format does seem much nicer to my eyes but I suppose tastes vary. A pain to have to change but it looks like good work and a new release is usually required some pressed Hackett anyway.
It doesn't put a "customized image of some sort" on servers, it literally iterates through installer steps with the autoanswers provided by preseed file.
You might say that it is customized since we wrote a preseed file. Well maybe, but it's not a "customized image". Also we didn't write any specific code to remove unwanted packages. It just doesn't install them. No weird packages like byobu :)