How big is too big? I haven't run into any size issues writing very unoptimized Go targeting STM32F4 and RP2040 microcontrollers, but they do have a ton of flash. And for that, you use tinygo and not regular go, which is technically a slightly different language. (For some perspective, I wanted to make some aspect of the display better, and the strconv was the easiest way to do it. That is like 6k of flash! An unabashed luxury. But still totally fine, I have megabytes of flash. I also have the time zone database in there, for time.Format(time.RFC3339). Again, nobody does that shit on microcontrollers, except for me. And I'm loving it!)

Full disclosure, Python also runs fine on these microcontrollers, but I have pretty easily run out of RAM on every complicated Python project I've done targeting a microcontroller. It's nice to see if some sensor works or whatever, but for production, Go is a nice sweet spot.