Whether there is any benefit of separating data/log files, setting fill factor, index rebuild/reorganize in a SAN storage?

Question

Let's assume that my storage is a SAN. This means it contains multiple disks. Even though we have logical drives configured, essentially everything - including the OS, SQL Server, and applications - all run on the same SAN, which means the data on the disk is highly fragmented.

So I want to ask: Is there any benefit when applying any of the following when the storage is SAN based?

1. Separating data/log files
2. Setting fill factor
3. Index rebuild/reorganize

Answer 1

No.

1. No: Separating data/log files
2. No: Setting fill factor
3. No: Index rebuild/reorganize

The only thing you can improve if you are using HDD on your SAN is moving to SSD.