Sure, as a total fluke in a very specific industry, software might sell itself. Everywhere else, and especially in physical product and deep tech, someone has to fully own the sales side of the business including the really time intensive stuff like website, email marketing, conferences, merch, sales meetings and trade shows. Heck, even viable solo founder companies would probably sell a magnitude harder with a sales co-founder.

Anecdotally my company picked up a few big distributor contracts for software tools and deep tech products, stuff people want. The products are done, high quality, but they don’t sell themselves - we have to actively put effort into outreach for every sale. Think about that in the context of your own startup. Building the thing is not the end hurdle, it’s kind of like a dependency to selling the thing, which creates revenue.

Have to call BS on this, no one argues when everything is going gangbusters. So likely the causation is the other way around.

Also everyone involved (from founders to backers) is incentivised to blame the interpersonal relationships since it protects their judgement, ego, etc.

That seems like a less interesting metric than the percentage of successful founders who go it alone. If there are just more startups because founding something alone is much easier, but you're no more likely to succeed as a solo founder, then all that's changed is the number of failing startups. That's not a great ad for starting something without a someone to share the burden.

FWIW in my experience with startups it's the relationship between founders that keeps the product on track and heading in the right direction. Founders keep each other honest (mostly) about whether something is worth building. When someone is going solo they build what they want, which goes brilliantly if they have taste and experience of their market, and horribly when they don't. And it's much more common to see the latter.

Indeed, for years, I was looking for a technical co-founder.

I virtually did not find the right profile serious enough for such a role.

I ended up learning software myself after graduating from business studies at university.

Then AI came in the middle of my self-learning journey, I started using it as a software writer. I thought I could 'vibe-code' it into anything I want.

I was wrong.

1. It made so many mistakes. 2. I needed solid understanding of software basics to be able to understand the code it is writing, to be able to architect a complex software for a startup idea I had in mind.

I went back to learning software from reliable non-AI sources. By the time I learnt so many things about software, I gave AI another try.

This time it worked.

I became an AI-assisted Founder & Systems Architect.

But it's only the beginning, AI is non-deterministic!

Happy Coding!

btw, if you have a chance to work with him you should! highly recommend