I imagine that even though the Angular team only wanted a 3-year support plan that it might go the way of Python 2.
If you want a decent middle ground, I'd learn the latest and then the major differences between 1.7 and 2/latest. Enough to say in an interview for a legacy Angular project that while you don't know x, later versions do it similarly with y, but you know enough Angular to be able to jump between versions.
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I imagine that even though the Angular team only wanted a 3-year support plan that it might go the way of Python 2.
If you want a decent middle ground, I'd learn the latest and then the major differences between 1.7 and 2/latest. Enough to say in an interview for a legacy Angular project that while you don't know x, later versions do it similarly with y, but you know enough Angular to be able to jump between versions.