MED tends to be in most people's BGP-101 toolkit. When supported by the receiving provider, it provides a good way to enable a solid "use this connection instead of that connection" feature. However, even when supported it's a big per-prefix hammer and really only helps in electing a single ingress. This is why many providers don't use the MED-as-specified feature. Rather, many use MED+IGP variants - that are not standardized in IETF! - to get the job done. MED is thus not even a good hammer many times, and may be a different tool (screwdriver?) depending on what the receiving provider is willing to do with it. And it only helps if supported by your adjacent AS - which might not be good enough if the traffic you're trying to bias is more than one AS hop away. As an aside, while the MED feature is beloved by operators, it is a massive PITA to implement. While these posts are about trying to "do something about" ORIGIN, if I had to take a feature to un-make, it'd be MED.