I hate to hear this. I always heard a lot of crap about Briggs & Stratton. I have owned a bunch of them and seen a bunch of them over the years. I never really personally saw but 2 bad engines the whole time. Both were the same engine and that was a head casting issue that got fixed. I personally owned one and it was totally replaced under warranty. The other my dad owned. It ran until this year. I rebuilt it for him and other than this it looked brand new. I told him how to better care for it for a bit and to be prepaired to buy another mower because it might last a few minutes or a few years.
I have always liked their motors, often preferred them. Especially the Vanguards.
I don't own any Briggs motors anymore, nor do I own any Ferris or Snapper machines. But I really hope all 3 can come out the back end. I have higher hopes though that Ferris and Snapper will make it. Yeah I know Ferris rides better. But the Snapper Pros didn't look bad to me for those who don't want the Ferris suspension.