2005 accord is 5 inchers longer, a couple inches wider and has a longer wheelbase. This results in larger interior space and trunk space. While cars are in fact getting bigger and heavier, in this case it's not as egregious.

you also could compare internal dimensions between 3: 2005 accord vs 2025 civic vs 2025 accord, I kinda believe 2025 civic will be closer to 2005 accord.

But I mostly referred on class in general: 2005 accord was basic appliance economy car, while 2025 accord has many more accura like luxury features besides drivetrain.

Yep, model inflation. I have an early 2000s Accord and it's smaller than most Civics I see on the road, and with fewer features than a base model Civic.