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> The iOS device line gradually shifts towards the M chips

No it doesn't - no iOS device has ever shipped with an M series chip...

> Isn’t the M line is more performant and energy efficient comparing to the A chip?

Yes to A, no to B.

Also, you're completely leaving out scale and cost. Apple has already made (ok, had TSMC make) hundreds of millions of A18 chips, so throwing an A18 pro in their least expensive laptop ever makes a lot of sense.

Yes, the iPad Air and Pro all come with M chips.

You said iOS, which means iPhones. iPads are ipadOS.

I don't think the M line is more energy efficient (at equivalent performance), just more performant overall and with more advanced features (more maximum display outputs, more maximum USB interfaces, more maximum memory channels, etc).

Why is that confusing? The A chip is cheaper, hence is goes into their cheaper laptop. The more expensive laptops get the more expensive M chips.