Unsurprisingly it's much worse than the website itself and not working well (look at the comments).
I think you have a point, but Twitter was very reliable until it was bought out, and served as a centralized notification channel where you could have all your sources, official and informal. I don't want to have to replace it by 6 different apps for weather alerts, drivebc alerts, wildfire alerts and so on; especially if they are worse than Twitter. I also prefer my government to spend money on the actual service (predicting weather, tracking and fighting fires, tracking traffic) than on duplicating the work of creating a delivery channel.
[1] https://play.google.com/store/apps/details?id=ca.bc.gov.Wild...