Yep. It's one of the trade-offs being a solo founder. But the rest still outweigh it for me.

There are ways around it, though. For example, I have standing meetings with friends all over the industry where I can bounce ideas, architectures, and implementations off them. It's important to keep your network going and fresh. Another thing I do is to look for meetups with likeminded people, which is a good way to get to know new people and bounce ideas.

I also sometimes outsource a smaller project and I'd have a coworker for a couple of weeks. ;-)