MP3 players are commodities now. Anyone who just wants iPod functionality can get it cheap, and there are even upmarket options for audiophiles with support for things like low impedance headphones that the iPod never supported.
There’s just not enough room in the market for Apple to re-insert themselves.
Also, they’d never ship a product that couldn’t somehow use AppleMusic.
The solar sail reflects light instead of absorbing it so you get to double dip on photon momentum.
And sure, you can steer with the laser I suppose, but with that kind of super weak deltaV, you’re not going to be exactly doing donuts in the solar system.
Even the massive solar sail only imparts a super small amount of force. It’s only useful because it does so for free over a long period of time with no air resistance.
You’d be better off using a conventional thruster to do whatever steering you needed to do before letting the sail take over. It’s not like you need to steer around any obstacles.