I think wireless charging slowness can be seen as a feature, not a bug.
Some EE major can correct me, but I think the slower you charge a battery, the better it is for its overall life. (So even for non wireless charging, if possible, it's better to use a 1 amp charger overnight than a 2 amp)
I had a Lumia phone that I charged wirelessly from 2012 to 2017, on its last day, the battery life was around 80% as good as its first day, much better than my friends' phones.
The only use case for me would be to put my phone at night when its battery was less than 20%.
Another thing I read about batteries is that it's better to charge them once a day[1] (so before nighttime) rather than many times during the day. Some people here comment that you always put your phone on the charging plate, I'm not sure this would be good for battery life.
Finally the best 'feature' I noticed is that it's really inconvenient to use your phone while it's charging on its plate, so you're less tempted to use it when going to sleep.
[1] http://www.motherjones.com/politics/2011/06/battery-charge-l...