> Your $30 phone likely cost far more to build, perhaps hundreds
When the platform was still new and well supported, and without any discounts or contracts, you could get Windows Phones at the ~$100 USD price that were every bit as fast and fluid as described. Phones like the Lumia 520 / 530 / 535 series.
So, if the discounted price bothers you, just read it as "For a $100 phone", as that was the brand-new day-one price at the time, with no subsidies / discounts / contract / credit-checks / loss write-off / etc.
Therefore, this statement doesn't make sense to me:
"For a $30 phone, it was incredibly fast and smooth."