partitioning - Why does the default installation make one choose either LVM or SWAP file (vs. partition)?

1. Why does the default installation make one choose either LVM or SWAP
   file (vs. partition)? See here.




2. Further, is it possible to change either option later
   (post-installation), i.e., either switch to a SWAP file (dropping
   the SWAP partition), or switching to LVM with the SWAP file running?

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