I guess I'll just speak to my experience. I've been using a $600 Acer Aspire E15 for a year and a half now (since Spring 2018), and it's been working great. It runs Far Cry 5 and heavily modded Fallout 4 without any problems. I suppose the most recent release I've tried was Greedfall, which runs fine, and although I'm not confident about something like Metro Exodus I'd still expect it to run acceptably, even if it couldn't manage great. I'd feel fine buying anything this season and I'd expect to enjoy the experience. For example, I'm planning on getting Cyberpunk 2077 on release day, and I'm assuming it'll run fine. Not "great," but still fine, especially at just 1080p.
On the other hand, I think in another year it'll probably have some trouble, and in Spring 2021 it'll probably be totally outdated for the newest stuff, especially higher end shooters. For me, getting three years out of a $600 laptop is acceptable. Probably in late 2021, if anything does get released that I'm excited for, I'll get a similarly priced new laptop. Maybe it'll stretch to 2022, so four years.
If I'd gotten a $1200 laptop instead, I think I'd be getting better results for something like Cyberpunk, or whatever else gets released next year, and it could've tackled 2021 games, but even then I don't think it would've lasted that much longer. I'd want to upgrade by around 2023, in the same way I'll want to upgrade this one in 2021. For me, paying double to get five years over three isn't worthwhile, especially if I can stretch it an extra year if nothing's catching my eye. I specifically got this one when I did because I wanted to play Far Cry 5 and wasn't happy with my much older desktop. However, nothing's really caught my eye this year besides Metro Exodus, and I can wait on it, so if I'd been "due" for an upgrade this year I could've stretched it out until next year for Cyberpunk (and gotten Metro then too). Cheaper laptops that "need" to be upgraded and replaced more often can save you even more if you end up not actually needing the upgrade that year.
Anyway, some comments based on my experience with the E15, the complaints I do have:
8 GB of RAM isn't really enough. Get at least 16. Especially because generally they roll VRAM for graphics into the total RAM, in practice you're going to split that number in half. If I knew I was getting 8 GB of "real" RAM and some more VRAM on top of that then I'd think 8 would be an acceptable minimum.
Splurge on a big internal SSD, especially if you're going for $1000+. I have a lot of games on Steam and a real shit internet connection. I spend a lot of time transferring games back and forth from an external drive. Worst thing is having to run Fallout 4 on the external because of all the mods, I don't have a good way to transfer it to the SSD temporarily and the load times are atrocious. I have a 256 GB drive and it's pathetic, get at least 512 or preferably a whole 1 TB.
Get something with a big case with big fans. Overheating leads to death, big fans are wonderful. A super big and weirdly light laptop that's mostly empty space sounds great. This kind of thing is honestly the only reason why I'd look at "gamer" laptops, I got the E15 partially because it just looks like a normal laptop, and the relative compactness is nice, but it gets super hot and has tiny vents.