Psychological ones? No, simply the lack of available reliable compilers for some platforms was my problem. I developed POS applications, where C++ would have worked fine, if we had a decent C++ compiler on every platform we wanted to support. Some platforms used GCC, but most used proprietary compilers - where C++ support was completely absent or very scetchy. When you can't use exceptions, the memory allocator is absolute garbage and leaks stuff on it's own and encounter various random compiler bugs, you quickly decide to stick with plain old C. C++ in my experience was an absolute mess when it came to embedded work (note that the last embedded work I did dates back from 2006, so not sure what the current situation is)

Also, C++ uses a lot more memory, which can also be a no-go when you get as little as 32kb for code+data, luckily with in-place execution.