Every game has glitches and bugs.. So what. The point is they work hard to fix them, and then release an update when it is ready to be released, which then has to be approved by different stores etc etc.
People play Grand Theft Auto - This has glitches, bugs, you can hack it, you can mod it.
People play Fifa - This has glitches, bugs, all sorts.
Every single game has glitches. Get over it. The game runs smoothly, the game doesn't crash. There's the odd issue with it, but it cost £7!!! An xbox, PS4 or PC etc game costs £35+!! People still go and buy them, and don't complain when glitches are found because it's part of a game.
Let's say they have 50/100 people testing the game. Yes they will find some, they won't find some.. The game then gets released to MILLIONS of people, playing on different consoles, different teams, different leagues, different challenges... It's law of averages.. More people will find more glitches.
Rant Over *drops mic*