If you intend to write in Japanese I would say it is entirely necessary. Nouns, adjectives, verbs, names, etc.. can all be written in Kanji. All of them can be sounded out in Kana. Anything in Japanese can be written in Kana. However, learning Kanji is important for several reasons. It distinguishes homophones (Japan has many), it makes Japanese much easier to read (since Japanese doesn't have spaces, Kanji is necessary to break things apart if you write in all Kana it would be difficult to read), and if you want to read Japanese at any high level you will need to be able to read Kanji. It is expected that if you read Japanese at an adult level that you understand Kanji. It might not be necessary for you to learn Kanji depending on what exactly you want to use Japanese for and what your goals are. For adult level reading and writing it is necessary. It is also probably very useful for traveling Japan since many things like store names will be written in Kanji.

https://www.italki.com/article/1125/Understanding-The-Writing-System:-Hiragana,-Katakana,-And-Japanese-Kanji-Explained

I apologize for any offense taken from my slow reply. Unfortunately, at this time I am working 60 hour work weeks and I am very tired. Yesterday after returning from work I logged on here to take one lesson and then fell asleep when I was finished. I did not mean to ignore you. Thank you for your correction. I had planned to look closer at what you had said before replying, but I guess you were in a hurry for a reply. From what I saw it looked very helpful. Thank you for your time.

ごめんあさい