rust takes AGES to compile literally anything. also the compiler on i686 requiring SSE2 instructions is a massive thorn in my side as a old computer user and is the primary driver of my hatred of rust lmao. it gets in my way quite a lot since rust has creeped its way into a lot of open source projects these days
Rust tends to break or not work entirely outside of modern PCs running Linux or Windows and this also annoys me a lot lol, this is the reason we don't have Firefox on 32-bit PowerPC machines either :(
You can't even build Rust on machines with less than 4 GB of main memory at this point
Also suffers from the C++ problem of being so overcomplicated that independent implementations are extremely difficult to write
Deeply unportable language pretending to be a new operating system
Rust is lovely to program in (IMO), but another problem is packaging. Rust basically statically links everything and it makes it an incredible pain for distributions to package individual rust libraries and applications properly. It is one of the most frequent complaints I see scrolling up the screen among contributors on #gentoo-chat.
another issue with the static linking is the larger binary sizes it causes, meaning more of my precious disk space is wasted!!! another big issue on extremely resource limited systems such as 90s equipment with hard drives measured in hundreds of megabytes. i have gentoo running on a OG pentium (coz its one of the few distros left that truely supports it, via their i486 branch) and i have a dedicated hard drive for all the package management files and other caches portage uses lmao
a 80386, multiple 80486's, a pentium-133, a pentium2, and two non-sse2 pentium4s. and they all have useful purposes for various things. things you cant do with an emulator