BUSINESS concepts behind the scenes:
a) What people don't understand about the SE strategy, besides economies of scale and a smaller, more powerful phone, is that the device was made to offer extreme value targeting a demographic using a specific strategy called "Price skimming": https://en.wikipedia.org/wiki/Price_skimming
The iPhone SE was designed to lower consumer's (Android users) barrier to entry (price) into the brand, to quickly gain market share, then sell them services or premium devices in the future. This is possible because of Apple's established reputation as a premium brand (as opposed to penetration pricing): https://en.wikipedia.org/wiki/Penetration_pricing
b) The "1st mover advantage" is a myth. Consider Facebook or Google, they gained near monopoly market share because they were first in their technology/approach, not market.
The 'Apple way' is to wait for competitors to test new markets and get consumer validation, lowering risks by learning from early competitor errors, then grab market share with a product that delivers a better UX due to its superior combination of technologies. Look at Fitbit's demise with the Apple Watch - Google is now trying to replicate its Android success by acquiring Fitbit- "2nd mover advantage" works if done right.
c) If a and b work, this will make no difference to users, considering that Apple's strategy will not be focused on apps (this is a strength in phones, not laptops), but rather to sell a value performance device for the general public.
The Macbook failed not because it targeted the wrong demographic (business users) vs Air (students and commoners) and Pro (other professionals), but because it failed to provide value as an 'entry level' device: low specs, highly priced - they (partly) wrongly assumed business users' willingness to pay a premium for portability (inelastic demand) without regard for the value.
Nevertheless, the Macbook offer (a 1st gen. test product) did serve its purpose by anchoring users to see the next better offer at hand- the Air. This strategy called "bundling" in 3 options: good (price), better (quality), best (both) often serves to guide users to avoid extremes by choosing the middle option (usually most profitable), also called the "center stage effect": https://kenthendricks.com/center-stage-effect/
I recommend reading Stanford consultants' "Monetizing Innovation" to understand these strategies: https://www.amazon.com/Monetizing-Innovation-Companies-Desig...
In short, if they can offer a value laptop (priced below ~$700, best deal ultrabooks at this range) in an old body design (12 inch) and best tech specs (A14 or ARM), then this could be Apple's 'Macbook SE' offer. Heck, even test a 1st generation with cheaper AMD's chipset.