Discuss HN: Android phones become incredibly slow over time

I have asked about 20 friends who all have Android phones and my anguish with how slow the phones become after 6-8 months is not singular. And yet, we see Androids out selling every other phone. Why is this not seen as a problem? I have the higher end Droid. I can only imagine what would the case be with cheaper models sold in Asia, South America.