Sure, you still can customize the kernel, it’s just not the same default kernel for LMDE. Kernels move differently in Debian but you can always install something like the Liquorix kernel if you need the newest, and Ubuntu still uses the HWE model IIRC.
What I mean is that it’s about the easiest package for the Mint team to package a custom version of. No dependencies to worry about. Or they can pull the HWE from Ubuntu and ship it with LMDE.
Why except the kernel? Of all the things, that’s the easiest to get custom.
Sure, you still can customize the kernel, it’s just not the same default kernel for LMDE. Kernels move differently in Debian but you can always install something like the Liquorix kernel if you need the newest, and Ubuntu still uses the HWE model IIRC.
What I mean is that it’s about the easiest package for the Mint team to package a custom version of. No dependencies to worry about. Or they can pull the HWE from Ubuntu and ship it with LMDE.