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That basically, not getting to temp, especially in the winter.
If the thermostat is stuck open, the coolant is always flowing through the radiator and being cooled. If the air temp is low and you’re driving quickly the radiator will be getting really cold, and thus the engine will be getting overcooled (hence your low temps on the motorway - extra airflow = extra cooling). You may have also noticed that the engine temp would climb when stationary but drop when driving (which seems the opposite of what you’d expect).
Your car should always get to temperature as it’s designed to, and the engine won’t like running cold.
Nef
Turkish
This has made me wonder if the thermostat is broken on my Polo. Gets up to temp fine in summer but barely gets above min during winter. Seems to be worse on the motorway as well. What was the sympton of yours before you fixed it?