Ha, I had a Miata back when it was the coolest car to have. Soft top. Poorly assembled, very noisy as expected. A cheap car. I paid $15K, which was a steal, and I almost threw up buying the most expensive thing I ever owned at the time. But, it was a blast to drive with the top down. And the girls loved it. I drove it cross-country with earplugs.My previous luxury car had active noise cancelation. It felt unnatural.
I'm sure Tesla would love to make the Model 3 even quieter... the laminated side windows are expensive and do help considerably with wind and traffic noise. My 2021 is noticeably quieter than the first version I test drove a couple years ago. That said, there's more work to do, and I understand it's a constant refinement process. Rear seat is quite a bit noisier than the fronts. Noise insulation adds weight, which detracts from range... let alone the additional cost (although the laminated side windows show Tesla is not against spending money on the problem; it's probably a bang-for-the-buck thing).
In addition to road noise, I found that driving the Model 3 over 80 MPH with a crosswind produces a lot of wind noise, as if a window was cracked open. Slow below 80 and it was back to peace and quiet.
I used to own a Mazda Miata (retractible hard top). Top up, it was so noisy on rutted concrete highways that you couldn't wait to take a break. The Model 3 is heaven in comparison! So, it's all relative. I'd love for it to be even quieter, though.