Webnovel Author: TheSwordOfWriting - Novel Collection

For the story there is a certain skill ceiling for the user to get the skill and for the user the reason he no longer has most of his skill is he can simply never perform them anymore. Say a swordsman with lvl 70 swordsmanship who uses his right arm all of a sudden where to lose his main arm, he would then lose levels in his swordsmanship, this is because the swordsmanship he can perform is at a much lower level. This is the reason the Mc no longer has nearly all of his skills because he can no longer feasibly perform them. Keep in mind for skills like Basic Practice this only effects the handler of the user. The reason the user can get a skill like this is because of his form as a training sword.

Have edited this clarification in as well as some explanation on the different skills in the paragraph comments. Thx for the inquiry.

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