I'm not convinced the Apple purchase has anything to do with it. Some weather apps are better in some areas. The Forecast Advisor site can show that. Before the Apple purchase Dar Sky was not as good as a general app for some places I frequent but it was and still is tremendous for hyper local matters and especially via using your phone's barometer.
From a long time in trail work, ski area work and and outdoor programs/events management I know I'm not alone in the awareness of how good Dark Sky is with the hyper local aspect.
Where we have two homes and do frequent travel my personal experience has been close to what Forecast Advisor has shown for years. My ski work and volunteering includes a retired and active meteorology and climate data visualization pro each. The pros and far more obsessed than I am have these same conclusions.
Overall the weather apps seem mature. There are some sites I wish were mobile friendly if not in apps. Some great apps continue to add and improve their layers such as Ventusky.
It is all very entertaining to me as I realize I no longer watch a barometer in my own home or make phone calls to people far away for such info.