[quote=@0 Azzy 0]
<Snipped quote by Euphonium>

Glad you brought up Obi-wan- since those two fighting is a great example of both a non force-sensitive person fighting effectively with up to four lightsabers simultaneously as well an example of a Jedi using a blaster to win a fight. XD
[/quote]

Yes, Jedi can use blasters for battle if they want. Still, it seems you've ignored the other two pieces:

[quote]Willingly submitting to a procedure that rendered him more mechanical than organic, he became a living weapon, granting him lightning-quick reflexes and devastating strength.[/quote]

[quote]Grievous was a skilled lightsaber duelist, having trained in the art of the lightsaber under the fallen Jedi Master-turned-Sith Lord Count Dooku.[/quote]

Both taken from [url=https://starwars.fandom.com/wiki/Grievous]Grievous'[/url] canon page.

[quote=@Zarkun]
<Snipped quote by Euphonium>

I didn't say non-force sensitive because I didn't mean non-force sensitive. I mean non-Jedi/Sith. There are other Force wielding sects in the galaxy, even in the era of the Old Republic. Hell, probably especially.
[/quote]

There's still no way 10,000,000,000,000 people walking around with modified lightsabers equipped with blasters, especially with all the factors to be considered.