Claiming that a derestricted pedelec isn't any faster than a pedelec is wrong. A derestricted pedelec can even be faster than a s-pedelec.
"As part of the German Naturalistic Cycling Study we measured and compared the speed of three bicycle types (conventional bicycles, pedelecs (pedalling supported up to 25 km/h), S-pedelecs (pedalling supported up to 45 km/h)) under naturalistic conditions. Ninety participants, divided in three age groups, took part in our study. Participants used their own bikes or e-bikes. The bicycles were equipped with a data acquisition system, which included sensors to record speed and distance, as well as two cameras. Data was collected over a period of four weeks for each participant. Nearly 17,000 km of cycling were recorded in total. The statistical analysis revealed significant differences in mean speed between all three bicycle types. Pedelec riders were, on average, 2 km/h faster than cyclists. S-pedelec speed was even 9 km/h higher. "
https://www.sciencedirect.com/science/article/pii/S0925753515001976
The limits of the European pedelec class is based on data like this. The pedelec can basically be treated as a bike because it's believed , in the bigger picture, to impacts it's surroundings like a bike. There is some data indicating that the 25kph speed limit is to high, since other road users have trouble distinguishing between bike and ebikes, and therefore misjudge the ebike speed in certain situations/terrain. And increasing the restriction limit doesn't seem to make the ebike rider feel safe:
"The researchers conclude that despite riders’ support for the helmet obligation, it remains a major challenge to safely integrate the speed pedelec in Dutch road traffic."
Bike EU
If we look at the data, the pedelec class makes sense. This is based on road cycling, that's where the pedelec came from. So why is this relevant for offroad use? Well, the pedelec has been allowed on non motorized trails (in several countries) because it impacts it's surroundings like a regular bike. Non motorized legislation tend to be about protecting trails, wildlife, fauna and other trail users from pollution, noise, excessive trail wear and keeping other trail users safe. Sure, a bike is fast and have an increased chance of harming other trail users, but the increased risk is accepted. Possibly because of the positive effects of having a more physically active population. Trail access for bikes is already enough of a problem, having a new and faster ebike class for trail use in Europe doesn't seem very likely.
I seriously doubt the EU will increase the 25kph limit because some people don't like how the bike behaves when the limiter activates. It's more likely the motor producing companies will try to improve the motor behaviour. It doesn't seem to be a big problem though, pedelec sales are through the roof. It seems to me the motor behaviour when being limited is a very small price to pay to have an electric bike that can be used on non motorized trails.