I don't think anything is technically deficient with rust. Biggest criticism I can think of is that it carries with it all the same supply chain attack vectors as other languages that come tied at the hip to dependency bloat.

The problem is the same problem with many open source communities, in that they are rabidly leftist and obsessed with purging anyone who isn't so. So they practice the typical leftist tactic of constantly expnding their foothold (install base) and then proceeding to dictate who can contribute and donate and even speak.