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I haven't spent much time dealing with standard partition. Aside from "LVM makes it easier" to manage disk, what really can LVM do that standard partition can't?

All I can think of right now is that your LV(Logical Volume) can be a combination of multiple hard disks. Can you also add size to your volume by shrinking another volume in standard partition?

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A big one is snapshots - freezing a copy of the disk at a point in time. This is useful for full partition backups.

Another is that logical space is abstracted from physical space, so if you delete a logical volume (partition) you can allocate its space to any other volume, even if space is not sequential. IE "you also add size to your volume by shrinking another volume in standard partition?" - YES

You can retrofit RAID.

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