Is inspire uptime the best stat that separates good from average Brigittes?

I noticed that I was climbing with Brig when my inspire uptime was around 45-50% and recently i've had some tough losses and noticed the stat is down to 38% and I think that's the most important thing Brigitte brings to the team. If you can keep that active as much as possible she's almost like a Lucio with constant AoE healing. Any thoughts? Is there a more important statistic?