It doesn't bother the Prius, and I don't have any evidence to indicate that it is any problem for the Camry. I have done this since day 1 on my TCH without any issues. I don't relate it to P&G because there is no deliberate speed change in the strategy.

Early on, I found the P&G was not a practical matter in the TCH because of its weight and power. It was/is very hard to keep the car in the stealth range (zero current area between battery dischage and battery charge) during a glide -- possible, but requires a light touch and concentration.

I resorted to maintaining an EV only speed at 40-42 miles per hour (Level terrain, more down, less up) as much as possible consistent with traffic conditions. My morning commute has a stretch of about five miles in it where I do this twice daily. The distance that I run depends on the SOC, but several miles at a time is typical. LIke you, I simply increase pedel to start the ICE if I hit a small hill or demand below sufficient battery state, then it's right back to EV as soon as everything is squared away again.

It is the ignorant among us that will eventually destroy us all.