Earlier quoted context omitted.
Not a big Problem, but being limited to 150 was one of the main things why my old ICE car to me felt unsafe to drive on the Autobahn. For short periods its just safer to be able use the most left lane at 160-180 than to go 120-130 in the Center and wait for a chance to overtake with not much headroom over the left at 140-150.
germany is one of the last countries where that may be perceived an issue. Literally all other countries in the world have a speed limit that is way below 150km/h. So top speeds above 150 are just there for germany and for bragging rights, not for any practical purpose. What's more interesting is the torque and acceleration available at higher speeds.
It's completely practical to drive long distances at high speeds because of the well-maintained road surface and well-maintained cars. There are plenty of stretches of the Autobahn with no speed limits.
This is a common scenario: you're in the middle lane, and a particularly slow driver is in the middle lane (who should be in the right lane), you attempt to overtake in your underpowered econobox, and out of nowhere a Porsche or high-end BMW is sitting on your tail, and you try to overtake asap to get back into the middle lane to let the other guy pass. This is doubly true if you're going up a slight hill, which exaggerates the lack of torque. Another common scenario is a truck driver, overtaking another truck driver in the middle lane, and you have to move to the left lane to avoid him (truck drivers are supposed to keep to the right lane).
Source: someone who's driven plenty of shit, underpowered rentals in Germany, e.g. a Fiat 500X and a Renault Captur. Why anyone, apart from rental companies, would buy these ugly, overweight, underpowered shitboxes is beyond me.