Yeah, those arguments are interesting and may potentially be true. Sam Harris makes good arguments for free-will being an illusion.
I think it's more useful to believe free-will exists, but I also think it's a skill that must be learnt, continuously sharpened and developed over time.
The last few years, I've personally been wrestling with the thought that free-will can only exists with God.
It is a hard thing to ponder as someone who considered himself an atheist. Because of it, I now think of myself God-curious 😂