It's September 1st, and the Diamondbacks have a record of 63-68. To get to 89 wins, an arbitrarily picked lower limit for a playoff spot, the team would need to go 26-5 with the remaining schedule. The Diamondbacks aren't going to go 26-5.
I don't say that with any hint of malice or glee. I wanted them to make it, too. Maybe you didn't, and, okay, that's fine. I think most fans thought it would be a long shot, and it made for an exciting August.
There exists in sports fandom the role of 'smug realist.' You know the type: always looking to bring the mood down, lacks imagination, feels a compulsion to inject a "reality check" every chance they get.