Aside from other comments, I’ll try to do it eli5
Image you have factory for producing lightbulbs. Every year the lamp manufacturer changes lamp to a different shape.
First year you are making square bulbs for square lamps.
Second year are making round bulbs for round lamps, but still square bulbs for people, that have last year lamp.
Third year triangle bulbs for new triangle lamps, but you still need to make old shapes for people who are using old lamps.
After many years you are making ton of shapes, but only 1% of people have those square lamps… So you decide it’s no longer beneficial to support them and focus on producing modern shapes.
Now imagine that you are making both lamps and bulbs, 100 different each year. Bulb filament is still mostly the same, just shape isn’t
>! filament=kernel android, bulb = build android, lamp = device!<
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