I already said why, density. normal pixel blades (non KR stick) use pixel strips that come in a 144LED per meter pixel density. Most the time I see single color strips, they are far less, usually around 60-80 LEDs per meter. Though it has been a while since I last looked for such a thing since RGB addressable pixels have become somewhat of a norm.
This is also assuming smallest pixels of 3535 footprint SMD LEDs. Smaller, I doubt you will get enough brightness for a blade. Not to mention the super small ones on adafruits site that are single color strips require a 9-12v power supply. Leaves all current soundboards out of use since they all are designed to operate off a single li-ion cell which is 4.2v at full charge.
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