Amplifier power versus maximum speaker input power

None.
The amount of power available from your wall to a light bulb is 1500watts, or 15 amps. But the 40 watt light bulb just uses 40 watts. It does not 'EXPLODE" because the wall can provide 1500 watts...
Same with the speaker and a more powerful amp.
The one caution is if you have crazy parties or children, then the volume may be turned up higher than the speakers can handle, like deafening sound levels..., and you might blow them up. (the same may happen with an underpowered amp.. it is just easier to do with more power...)
In any normal listening, no problem.

There are no negative ramifications. The problems are caused by to little power, not to much

Somut, RMS power delivered to speaker is very low (in order of few percent of peak power)*. Your speakers rated for 100W RMS should easily take many times higher peaks. Weak amplifier (without soft clipping) can easily damage tweeters because clipped (squared) signal contains a lot of high frequency energy (harmonics) normally not present in musical material.

*Half of the loudness is equal to 1/10 of the power, plus music has gaps. Peak power is more important than RMS power.

The drawback I had with high power amplifiers driving efficient speakers is that I couldn't bring my volume control much past 9:00 on the dial. This is not a good idea since most pre amps sound better if more of the volume dial is used.

Somut,
Given your stated listening levels,unless your room is huge and you sit far from the speakers, most times your amp is only putting out a 'few' watts of power.