They don’t bother to trim pots because they assume you will do the trimming by turning the shaft! If you want a real accurate one buy a wirewound. Costs a lot more. Most standard resistors are only 5% accurate. Capacitors are even worse.
Typically circuits are designed to use negative feedback to force them to be accurate, so the precise value of a resistor or capacitor is not important.
Most of the laser-trimmed components are voltage references, A to D, or D to A converters.