I don't think that it's fair to call it a boring match.
It depends on the context, you must take this match for what it is, Cornet in form, and a better player, verses a girl with next to no experience against any top 100 players; let alone top 20!! she was a bit out of her league. And for that matter, I quite liked Sevastova's game... a few nice dropshots and some heavy flat groundtrokes, with an 'easy technique', she reminded me of a less powerful Petra Mandula.
Like any female player with a low ranking, power is not her problem, just a poor second serve, and lacking court speed/poor moment.
Otherwise, I have seen much more boring matches in my time, (ie. Australian Open final 2009). It was just a routine match for Cornet that's all.