I love Tailscale, but you are really then just substituting one company's remote access for another's. I'm quite certain that TS are more capable of creating a secure system than Ubiquiti are, but still, the principle of not trusting others with access to your network, is violated by TS.
I agree that enabling any form of remote access controlled by a third party increases attack surface, but I also feel like Tailscale has earned more of my trust than other vendors with the quality of their past security responses.
That incident ended badly for anyone that had a Windows box and got 0wned. Tailscale's response was good, but my trust in the software they produce was damaged by that incident. I'm a current Tailscale user (esp with their AppleTV app), but that incident wasn't good.