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According to many threads on usage of 'for me' and 'to me' here, I think that I have got a gist of the difference between them, but I still have some questions on it.

1) This is good to me. VS. This is good for me.

2) This is beneficial to me. VS. This is beneficial for me.

3) This is important to me. VS. This is important for me.

4) This is easy to me. VS. This is easy for me.

I know that there is a meaning difference 'to me' and 'for me' in #1, but there is not a meaning difference between them in #2, right? However, I am still confused with the usage in #3 and #4 because people say different answers to them. So I would like to ask what you think about the usage and meanings in #3 and #4.
Thank you so much as usual and I hope to hear from you again. Then, have a good day.
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I"m not quite in alignment with the answers above regarding the "to" answers.

"This is good to me" is not quite as natural as "He is good to me" (or a person) - He is good to me - he treats me well.
2 is not very natural as is with the to. If you want the version that means "in my opinion" switch the order. To me, this is beneficial.

3 I have a personal stake in this. I care about it.

4 same as 2.
Comments  
1) This is good to me. = In my opinion, it is good. (generally)
This is good for me. = It's suitable for me and it can give me benefits.
2) This is beneficial to me. = I think it's good for everybody.
This is beneficial for me. = It does help me.
3) This is important to me. = I think it has a great effect on things.
This is important for me. = I do need it.
In #4, it doesn't have a clear difference:
4) This is easy to me. = In my opinion, it's easy.
This is easy for me. = I can do it.
So in #4, I think to and for are interchangeable, because we don't have a certain context here.
GN
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 BarbaraPA's reply was promoted to an answer.

I look at it this way. A single woman involved with a married man may say “He is good to me.” as the gifts and attention make her happy.

But if her goal is to become married then the relationship with an already married man is NOT good for her. As the married man who is being good to her already has a wife.

Subtle difference but with serious life altering consequences