So i feel SF is in not that good of a spot right now.
I feel Valve has tried to cater a bit to both magic caster, but the magic casting build always ends up being the better option.
I feel to make SF right click interesting they need to give him a very good Aghs Upgrade, something that basically makes him go for right click attacks.
And i though about an idea.
SF new Aghs
Upgrades Necromastery. +10 Souls.
Each Soul now also provides 10 Attack Speed.
Every 5 attacks procs a Lesser Shadow Raze on the enemy. Lesser Shadow Raze deals 50% less damage, but each Lesser Shadow Raze counts as additional Stack for Bonus Damage.
This basically brings back Right Click SF, but also makes Spell Caster SF a very good option.
Procing Shadow Razes every 5 attacks plus getting +10 more souls and also 10 more attack speed per soul means you will be able to proc a lot of magical right click.
Turns you into a very similar hero to Silencer or OD if you decide to go Right Click, as you need to build your Stacks and then hit like a truck.
This would make SF much more fun and versatile.
Source: https://www.reddit.com/r/DotA2/comments/o9744v/shadow_fiend_aghs_idea/