Seeking info on FSFS benefits(2) (English)

I think FSFS advantages as below.

• don't depend on BerkeleyDB (BDB) versions.

This is great advantage. This causes subsequently

• We don't have to rely to one (large) binary database.
• Crash recovery of FSFS is looked easier than that of BDB
• By looking FSFS file structure, It looks easy to understand Subversion's version control policy(or implementation).

and I'm afraid of below:

• Processing performance in many revision files.
• It looks depending on filesystem performance.
• more files in one directory, less performance. and now revision and property file per revision is placed each direcory(revison directory and property directory).