They are qualifiers, subject to the usual competitive game criteria. A back door route into the next Euros.
Nothing particularly wrong with the idea, except the playoff round in 2020, (the side door route) after the draw for the tournament proper has been made, which will affect tournament preparation.
Hate playoffs. If you haven't made it after 14 qualifiers, you should let those who have, get on with the rest of the competition.
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