Hello again, that's pretty much same as mine. You'll notice driving for longer that it should eventually get to 78 or thereabouts.
If you have the heating up hi and fans on more than setting 1 whilst In stop start traffic it can take an absolute age to get to full coolant temp.
When I switched to my first diesel which was an insignia I noticed it didn't heat up as fast as a petrol but our accords are even worse.
To confirm thermostat is ok quickest way is to get yourself on motorway fan speed 1 with heat set to lowest (or just switch climate control off) and monitor coolant temp on your app. If thermostat is fine you should get to 78 degrees after it goes to around 80-82 degrees. Should only take around 20 mins on motorway.
If it doesnt get up to 78 then your thermostat is stuck closed.
I changed my thermostat when I first got the car and there was no change, it's just the way they are.