You have to strike a balance if you want to enable contact with the outside world. Sure, uncompromising data protection is possible, but then no one will write to you because most people don't make the right tech choices. It's not like every initial inquiry contains a state secret. For more sensitive content, you can always resort to other means. This all-or-nothing attitude is simply not realistic.
I agree, however it would be of no added complexity for their visitors, if Watchman self-hosts his email server, had a contact form on his website and also offered a Simplex address with the advice, that Simplex is easy to install and probably the most secure way of contacting him. As for self-hosting the website and not using Google Fonts or cloudflare that's even more of a no-brainer as his visitors would not even notice that but still benefit from them not being tracked on his websites. So I do agree with @SimplifiedPrivacy.com Podcast's points.
Why can't one legit choice be on the menu? Just as an option? It's not about it being a state secret, it's that he's not using freedom tech... like nostr. So if the freedom tech influencers won't use freedom tech, then how we gonna grow? I'll tell you how, we stop letting those individuals be the freedom influencers