Does FICO even matter anymore? I remember they changed the algorithms over the past few years and I think the banks have their own scores that the public don't

Does FICO even matter anymore? I remember they changed the algorithms over the past few years and I think the banks have their own scores that the public don't see. I really just use my FICO & credit report as a ballpark figure to see how banks look at me, and to check there isn't identity theft or other shenanigans going on.