

I think what just_another_person means that Lenovo, specially at the beginning when they got the Think-brand from IBM years ago, tried to ride the brand and released sub-par laptops under ThinkPad -brand. At least some of the L-series were closer to what you could get from your local supermarket than actual work machines.
The brand-riding is now greatly less and the crappy ones generally aren’t the models you can find refurbished from 3rd party retailer. I’m currently using T495 and it was ~300€ from a sale couple years ago, now you apparently can get L13 for less than that. And of course, when you buy used units do your homework and only make deal with a reputable seller, there’s always an option that previous owner didn’t treat the thing nicely.
I wouldn’t say that Mint is a ‘beginner’ distro. Sure, it’s beginner friendly, but it’s equally friendly for everyone. I’ve been a linux user for “a while” and currently I prefer Mint on my workstations. It offers me everything I need from a distro in a neat package and as I’ve been a Debian user since Potato it’s a familiar environment.
But if OP want’s somehting “more linux-y” then good old Debian should do the trick. Basically anything with decently long history besides Ubuntu (in it’s current state) will do just fine.