system, vendor mounted as read-only in fstab

[disposableone]

This recovery.fstab mounts system, vendor, product folders as read-only. This is not the usual default TWRP behavior. Why this?
system /system ext4 ro,barrier=1 wait,logical,first_stage_mount
vendor /vendor ext4 ro,barrier=1 wait,logical,first_stage_mount
product /product ext4 ro,barrier=1 wait,logical,first_stage_mount
odm /odm ext4 ro,barrier=1 wait,logical,first_stage_mount