I agreed with you! Never invest all your money in Bitcoin.!
Bitcoin, while it has gained significant popularity and value since its inception in 2009, is still considered experimental and has some inherent risks associated with it. Here are a few points to consider:

Volatility: Bitcoin's price can be extremely volatile, leading to rapid and unpredictable fluctuations in value. This can result in substantial gains, but also substantial losses.

Regulatory Uncertainty: The regulatory environment for cryptocurrencies like Bitcoin is still evolving in many jurisdictions. Changes in regulations could impact its legality, use, and value.

Security Concerns: While the underlying technology of Bitcoin, blockchain, is considered secure, there have been instances of exchange hacks and wallet breaches. It's crucial to store your Bitcoin securely and be cautious of potential security vulnerabilities.

Lack of Consumer Protections: Traditional financial systems offer certain protections and mechanisms for dispute resolution. Bitcoin transactions are irreversible, so if you make a mistake or get scammed, it can be difficult to recover lost funds.

Technical Risks: As you mentioned, Bitcoin is still considered beta software in many respects. It's built on complex technology, and while it's been functional and operational for years, there's always a risk of software bugs or vulnerabilities emerging.

Competition and Innovation: Bitcoin was the first cryptocurrency, but it's not the only one. There are numerous other cryptocurrencies with different features and use cases. The landscape is continually evolving, and the dominance of Bitcoin is not guaranteed.

Given these factors, it's generally recommended not to invest more than you can afford to lose into any asset, including Bitcoin.