Hey William, hope you are well!
I cover Intervals in Piano Lessons for Producers.
As you said, no, they are not necessary to know.
A lot of music theory is "good to know", but in reality, learning to produce chords and melodies for beats truly comes down to knowing a key and scale.
Once you know a key and scale, you will then muscle memorize the chords available to you.
You should be practicing piano for at least 5 minutes a day (even at my level) to keep to fine-tune your improvisation skills.
There's two types of musicians, really..
- One who can only read sheet music and play another person's music..
- One who can improvise and create their own music from scratch (which is what we want to be as beatmakers!)
Understanding a key and scale will help you achieve #2 there.
I also like to practice piano over a "click track", like my Piano Drum Loops, to practice piano as a producer in a real-world setting.
I hope that helps you move forward..