Is there any truth to this question?

Well yeah bigger amps do have some issues at low power if they are cheap.
If you are using Pass or the big Bryston 28B-SST2 they are not gonna have that issue. (but they also cost $20 grand...)
For cheap amps, yeah, use one sized to fit your needs. Having a better quality low powered amp is gonna sound better at low volumes than a same priced but much more powerful amp. (in general yeah thier might be an exception. but dollar for dollar, a low powered amp is gonna have better parts at the ame price point)

Also, it USED TO Be an issue with any high powered amp, but not anymore. Now modern high powered amps generally have overcome the issues high powered amps used to have.
But those still cost a LOT of money..

NO!

Why?... Because everything matters and no two systems will react the same or sound the same. You will have to listen for yourself in your room with your specific components to determine your favorite pairing. Sorry, but that is the way it goes. Absolutes do not exist in audio only in Vodka:-)

Does a bigger amp always sound better? No.
Can a bigger amp sound better? Yes.
Are lower powered amps simpler and easier to make sound good? Yes.
Do you sometimes need high power? Yes.
The "BEST" power amp in any given situation is determined by a series of variables, room size, preferred volume, individual taste etc. The best rule I have found is don't get more power than you actually need but make sure you have enough; see how simple it all is? LOL

Another question to which I am looking forward to answers. Two in one day. Not bad.

E
When you say issues...what are they?