I liked Opencode a lot previously but there's no doubt it's not well-written software. Pi has fully replaced it for me and there are quite a few newer options that learned from Opencode and exercise more minimalism where it matters
It hardly matters that it's vibe coded and ugly if it works well... and it does (for me).
Saving a few CPU cycles and reducing RAM utilization on my local system isn't going to meaningfully improve anything in and of itself; the wall time is all bounded by the model or by the code it's invoking (i.e. compiling or running the test suite).
All of the major search engines have understood that as a stand-in for "Go the programming language" for many years.
It has overridden a 4000 year old strategy board game played by millions (mostly Asians).
It doesn't have to be, of course. But if you're bothered by something in general in life, and there are two approaches to solving the problem, one that involves others doing the "right thing", or another that involves you changing your approach to it, then usually the latter is much easier to actually address, than the former, as it relies on changing the behaviour of a ton of people.
It's just a tip to make things easier for yourself, without needing others to change. Still, you can do things however you like to, no one is forced to do anything :)
I generally view the kind of code in projects like OpenCode to be the same as binary machine code, and the harness that works on it is the compiler. The source code is the prompts (I guess), except we live in a weird state now we use the existing machine code + more prompts to make even more machine code.
It's written in Rust. It seems to perform well. It also seems (from my poking around in it) on the whole well and deliberately written. It doesn't consume memory like a mf'er like Claude Code. It doesn't sit and chew background CPU like I've seen opencode.
I suspect it will accumulate more specific-to-OpenAI-isms over time though.