Try this follow-up review/demo https://www.youtube.com/watch?v=fCKMxzz9cjs

As asked, that question is nonsense. for it to make sense, one must define "everything one would want to do" very precisely. As for the apps it will run, almost any of them with a Linux version that will run on the processor. That is a moving target, as development is ongoing.

No need to be rude. Your inference is also maybe incorrect - as wpeckham said, the question, as asked, is problematic. There's nothing about the current state of Pinephone, at least running Manjaro, that isn't suitable for day-to-day use - that is, the distro itself is stable enough, applications build and run, the battery charging works (for a time the kernel would cap the battery charge for safety), the peripherals on the device work (e.g. camera, modem, touchscreen, etc) and you've got a fully functioning touchscreen computer in the palm of your hand (just like an iPhone or an Android device). However that doesn't mean it has the same software compatibility - it isn't an iOS or Android device, so if you insist on using 'apps' then you'll probably be waiting forever for that to happen. However (with limitations around it being ARM rather than x86, along with its relative performance, memory, form factor, etc as applicable), it can do anything any other linux-powered computer can do. That doesn't make it any more or less 'real' as a 'smartphone' - like I said, best to think of them like gaming consoles rather than general purpose systems. Your question is a bit like asking if a Playstation is a 'suitable console' based on whether or not it can play Super Mario Bros - it's an example of a True Scotsman fallacy (https://en.wikipedia.org/wiki/No_true_Scotsman). Also remember that in many cases, the 'app' is just a skinned, application-specific browser that connects the user to whatever web portal/site/server that the provider/organization/whatever is offering, usually to circumvent the browser and security/privacy/etc features that it may try to enforce, and/or to tailor the UI for a mobile device. A lot of modern cloud-based 'services' still offer a browser-based variant of their 'service' in order for things to work on desktops and laptops so a modified variant of the response could also include: "if you can do it in Firefox/Chrome/etc it will also work" - but I guess I assumed that was safely implied.

I have to agree with the last two posters - in that being able to run proprietary software, which is coded specifically for a proprietary platform, is not relevant for means of comparison. Those "app" developers delvelop software (usually some hacked together chrome based thing) specifically for those platforms. It is they, or those who employ them, who decide what to support.

For my use case (see post #5) the answer is a resounding yes.
I use the native OS for most tasks, and that's just fine. Apps exist in abundance but for a few things I have to resort to the Android support. I'm not sure how it works technically, but it works 100% so far - OK, maybe 99% - I sometimes have to tap a UI element twice instead fo once to pull up the keyboard, little things like that. But I have had video conferences and Signal calls no problem.

Finding it difficult to locate "SOLVED" to this thread.

I've backtracked a bit since I discovered my ancient T61P Thinkpad has a SIM card reader. I figured I could try out a few distros and get familiar with performance and choices but I ran into a serious snag. Apparently, SIM card readers on any PC can work in Linux, but the validation/activation of a SIM currently requires Windows. No success yet. I would like to hear from anyone who uses a laptop, tablet, or PC for cell calls.

Not probably immediately helpful, but this functionality does work on Pinephone in its distros - maybe go digging into how Manjaro or another Pine distro is handling things?

Note that just 'reading' a SIM is not enough - it also needs a modem.

the Raspberrry pi 2, 3, and 4 are suited.
duckduckgo video with search "Make Your Own Raspberry Pi Cell Phone"

pine64 with add-on sim.

the openpandora and the pyra can be modified to phone.

Thinkpad x250. Not for calls, but for mobile broadband. 4G.
No problem, as soon as I installed NetworkManager & ModemManager.

Why would it require Windows when your phone doesn't run Windows, either?

Well, I'll say it's a very interesting option. Thanks and regards.