That’s a negative. You’re more likely to fry a speaker by UNDER powering them. An under powered amp will clip the signal if turned up beyond its capabilities. Clipping = straight DC to your speakers. DC = kablammo.
Also, for sound quality you want more power. An amp’s abilities are not linear - that is, it’s ability to produce a proper signal are not the same at all power levels. All amps have a sweet spot and it’s usually at the lower end of their power spectrum.