I have never played a PnP game myself, but I have played lots of computer RPGs.
In this forum there is a discussion that compares Baldurs gate 2 with deadfire, and I also added the witcher as an argument that we should get rid of alignment systems.
BG2 was my first contact with DnD rules and I did not know what DnD or PnP is at that point. I saw only the very complicated rules of a computer game. Regarding alignment I considered it an arbitrary restriction that makes no sense. I did not understand why a bard has to be chaotic ( not sure if I confuse DnD2 and DnD3 here) and I thought the system encourages you to be "lawful stupid" or "evil stupid", even though I did not know these terms back then.
So finally here are my questions to people who have actually played PnP games:
- How much does your alignment limit what you can do?
Something like: No, you cannot try to steal an item because you are lawful. It does not matter that you need this item to save a town and the owner would rather kill you than giving it to you.
- Is it normal that characters change their alignment?
If you go out on an adventure you will experiance many things, both heroic and traumatic. I think that some of these events can change a person a lot.