Is there some sort of best practice around removing them (when/how/why)? What is the point of keeping them around in the first place and why would you even put them in grub?
I guess there is not a "problem" per say, but I am just curious about that design decision.
Correct me if I am wrong, but you can still use the old kernels with the new user interface right?
The short answer is they are used "as a backup". New kernels are tested on a large amount of hardware before being released, but can't be tested on everything. If an update causes the machine to not boot successfully, then the previous known-good kernel is available as a fallback.
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