Are they? Look again!
Using the terminals on the rear of the socket and using non-flexible 2.5mm cable, often means a poor connection. The amount of times I have taken out a socket to find the two 2.5mm cables have moved near out of the connection, or dropped out, is quite a lot. Wagos make a vastly superior connection than shoving two cables into one terminal that could loosen over time or be party dislodged when pushing in the socket using non-flexible cable.
Having Wagos secure the integrity of a ring is a great approach - superb in testing for the 1st fix. Then having flex from the superb connections Wagos give to the socket, with only only one wire connection at the socket, with no chance of the wire being dislodged in the socket connection as flexible wires are used, improves continuity and safety by a considerable measure. Ramming two 2.5mm cables into a socket terminal using non-flexible cable is a real dumb idea.
A win, win, all around. Safer! And quicker.