Yeah most people don’t notice a difference because RTP isn’t something you can feel in a short session. What really matters is variance and volatility, the size of the swings between wins and losses.
An enhanced RTP game doesn’t mean you suddenly start winning more often, it just slightly shifts the long term math. If you’re playing a high volatility slot, you could still run cold for thousands of spins even with a higher RTP.
So yeah, you probably won’t notice a difference, but that doesn’t mean it isn’t there. It just takes a huge number of spins for the higher RTP to overcome the variance.