I think the correct answer will depend on the individual. It depends on what your goals are for your music (what do you want to do as a pianist?) and your aptitude for reading music and/or playing by ear.
From your question I would conclude that you have the aptitude and ability to continue to hone your skills at reading music and also the ability and skill and gift of being able to play by ear and improvise.
For me personally, music is more of a hobby but I do have the ability to play by ear. I believe that ability contributed to my unwillingness to commit to learning to read music with any degree of competency.
My mother was a pianist and could play any written piece of music set before her just by reading the score on paper. I was always amazed and impressed and envious of that ability. I set out to learn to read music myself on the piano that was in our home. But because I have the ability to play by ear, I found myself reverting to playing by ear and from memory once I painstakingly learned an arrangement by reading and playing the notes indicated on the score.
It would take me a long time to get through an arrangement to see and hear what the composer had in mind. But once I could play it through one time - it was much easier for me just to play it from memory from that point forward. So I took the shortcut and never learned to read music very well.
Then I switched to guitar and ventured even farther away from developing an ability to read music - but have learned to play acceptably well by ear.
If you want to be a professional pianist and be able to play music that is provided for you to play - it might be best to advance your music reading skills. If you play for your own enjoyment (or the enjoyment of friends) and play songs you select, it might not be as important to be a proficient sight reader of music, if you can play by ear and improvise.
Of course if you want to compose music, there could be an argument for furthering and improving your music reading ability. Or you could do like I do and compose by ear and record the notes by playing them on an instrument while recording.
As for me, I am able to continue to compose my own music to accompany the lyrics I write for my original songs, continue to expand my repertoire of cover songs that I can play from memory, and continue to entertain folks with my music on stage in venues where I am paid to entertain, and continue to enjoy the heck out of playing music. And I forgot almost everything I learned as a child about reading music (and feel no need or desire to learn at this stage of the game).
But your goals and aspirations and motivations and abilities and willingness to spend time learning the more academic side of music (reading and composing on paper) may lead you down a different path. There is no right or wrong approach to learning as long as it helps you accomplish your goals and most importantly - as long as it advances and supports your enjoyment of making and playing music.
The choice is yours. Just be sure to enjoy the journey - whichever route you choose to travel.