Since this question is more general, I’ll add my input!
A life almost completely free of pain would be good. However, the word “good” is where it ends. There is no wonderful, there is no amazing, and there is no spectacular. Why? Well, even though it may seem like a painless life is like living in heaven, the idea also has to be taken into consideration that without pain, there will be a large absence of appreciation for anything good that happens. Without pain, everything is already good as it is (if we are referring to physical and mental pain both here). People would also not see a need in encouragement or motivation for anything because as mentioned earlier, everything that happens is good by itself. Since everything is good, there would be no point in excess motivation or encouragement for something you know you’re going to do good in. Additionally, we as humans must know what pain is to love. Unlike dogs, who provide unconditional love, humans always arrive at one point in their lives whenever the love they give to somebody depends on something they benefit from. Without pain in our lives, we would not truly be able to comprehend what love is and how to love one another for the good and the bad. If you need help, let me know and I will gladly assist you.