Unfortunately, these poor x280s haven't aged well.
Intel has always been burdened by insufficient integrated graphics, the x280 models having soldered in RAM killed future proofing of a fairly decent CPU, with 8GB of RAM really hurting performance as windows itself heats up roughly half.
Most current laptops, especially with dedicated graphics, easily work as desktop replacements.
You have to fully understand, that a simple mini PC like this
...has more than a 70% performance advantage over your current Core i5-8350U, and equivalent performance to a current Core i5-12600 desktop CPU. And the integrated graphics, are close to the performance of a GeForce GTX 560 150W DirectX 12 graphics card from a decade ago. Still, it supports up to three 4K @ 60Hz monitors.
So this is "ground zero" in your laptop search.
At this point, it's up to your budget.
A number of our clients have this laptop as a dual purpose PC
When it's not mobile, they have it sitting on a cooling pad
LiANGSTAR Laptop Cooling Pad, Laptop Cooler with 6 Quiet Led Fans for 15.6-17 Inch Laptop
With a USB C DisplayPort docking station of their choice.
Hope this gives you the information that you're looking for. If you have any questions though, please let us know
MaxProAndU Team