Why Low voltage ceramic capacitors are mass-produced with a simple high-dielectric-constant ceramic disc or chip, so they are among the cheapest capacitors available. That cheap high-K dielectric comes at a price in performance: typical tolerances are loose (often 20 percent or worse) and the capacitance drifts noticeably with temperature, applied voltage, and age. They are fine for bypassing and coupling, where the exact value does not matter.
Watch out Tight tolerance and high stability describe precision types such as silver mica, NP0/C0G ceramics, or polystyrene film capacitors, not ordinary low voltage ceramics; the highest capacitance per unit volume belongs to electrolytic and tantalum capacitors.
Ceramic = cheap and cheerful. Cheap, but not tight, not stable, not the biggest farads per cubic inch.