No.

For it to be a good investment it’s value would have to go up over time or drop at a slower rate than other comparable things.

A mac is a better investment (but still not “good”) not only because they tend to hold more value over time but the used market has higher volume so there’s less chance you need to price it low or wait a long time when you’re ready to sell.

If you’re worried about the value of being able to fix it, spend less than your $500 budget on a used t480 with the processor you want, upgrade the ram to 16, 32 or 64gb, install at least one ssd and be glad that there are literally millions of inexpensive spare parts on the market and will be for at least a decade.

What framework does uniquely offer is the ability to change your complement of ports. That’s either a useless novelty or a powerful tool depending entirely upon weather you consistently swap them out and can find all the ports you need as expansions or not.

Is it worth it to not be carrying around some dongle? I don’t know.

E: the processor to get on that t480 is one of the intels.