Steve hasn't been a relevant force in OSM for more than a decade and if you want to do OSM a favour, point people to the editor on openstreetmap.org, not any of the mobile or "simplified" editing apps.
If you want to make the time to take photos and take notes, and sit down later and enter them on your computer, go for it. Likely that's a faster way to do a larger entry. In particular, I haven't seen a mobile app that does a great job of polygon geometry editing — a mouse really helps.
But I don't think it's a problem to do simple POI entry or attribute updates from a simpler mobile app like "Go Mapp!!". I think like many things, the best mapping tool is "the one that you have with you".
Am I missing something?
In the mapping events I’ve attended a clear goal was to onboard people into contributing casually and frequently as they go about their everyday lives.
(For context I can’t see the linked Twitter thread and have no idea why you’re talking about Steve)
I was able to do edits in RapID (the Facebook fork), although you need to reload between each edit.
While direct entry (on the phone) is what I would do and would recommend for anybody that already knows the ropes, it is going to be overwhelming for a beginner.
PS: I was commenting on the whole thread, and if you look through it you will see Steve mentioned as the OSM savant.
I wouldn't have made most of my contributions (or even started mapping) if I had to use their website on a tiny screen or had to take pictures or notes to add it later when I had my computer. I use their website, but that only for more advanced stuff.
The right approach is approach is probably somewhere between the two extremes. Teach new users about the website, but also about apps that let you quickly fix/update/add new stuff right on your phone.
You don't have to do this yourself, just understand that simple apps are a good way to bring new users in, that they're good enough for a lot of tasks, and that this newer generation of tech users usually prefer apps to web editors.
Except that the numbers show the opposite.