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Reasons for NOT having a separate /boot partition
Not having a separate /boot partition is less hassle. It is the default for all Linux distributions and is suitable for most systems and home use. Use a separate partition only you have a very good reason to, for a specific need.
Reasons for having a separate /boot partition
Not mentioning historical reasons that are typically no longer valid today.
Use a separate /boot partition if:
* the boot loader cannot read the root filesystem, because of encryption, esoteric filesystems not supported by GRUB, etc.
LVM support was added to Grub 2 in October 2016.
* Dual or multi-boot: if you install several Operating Systems (e.g. several Linux distributions), and relying on the /boot of one of them, wiping that OS will render the system unbootable. With a separate /boot, you can delete/reinstall any OS but keep the system bootable for all existing OS's.
In case you have a separate partition for /boot, simply use ext2 for its filesystem as additional features in ext4 would not be useful.