While Forza Horizon 4 and The Crew 2 were released back in 2018, both are still receiving content updates and continuous support.
Ironically, this. There's been plenty of talk in this forum about how the only real difference between NFS and these two is "but cops" and how that's an extremely specific niche to cater to, especially when one considers just how far behind they've been in just about any other area.
With Heat.. It feels a little like Ghost have finally realised that they do not, in fact, work in a bubble where nobody makes games but them and/or they ship games based solely on three letters on the cover, but rather have to contend with an open-world driving game genre that - while maybe not as crowded as it was at the start of the decade - is alive, kicking and constantly evolving. As it should be.
That's what I mean when I say Heat is "solid" - it's the equivalent of a car with all level 1 upgrades; it'll keep you competitive for a while, but neither its speed nor handling will overwhelm you in any way, and if you're not careful, the competition is still going to overtake you. It's a decent setup for now, but they still need to build on it.
As for the traffic thing, I've done a bit more science: you know that road in Downtown that goes from the industrial-ish area just north of it to the circly-thingy in the southern end? I drove that road from start to finish - not all of it obeying the speed limit, mind - taking care to note each and every car I passed - driving, parked, on that road or on an adjoining one.
My final count was 27. Most of which were indeed not on what I assume would be a major arterie in the city. Considering just how long a stretch of road that is, surely bumping the traffic spawn rates (at least when you're just freeroaming around and the cops aren't on your tail - though Most Wanted did that thing where it despawned civillian traffic beyond a certain heat level, nudge nudge) up to roughly those numbers occurring on that street itself wouldn't hurt. It is *current year* after all.