I have some analysis and attention.
I'm testing all the time and I'm not convinced of WP PM.
I am not sure if the concept to build a project management system in WordPress is correct.

1) We get a solution that has its pros and cons of WordPress, all its superstructure.
And all in all, I don't know why, since everyone is managing in the WP Panel.
I'm wondering if it's better to developing this system a new one without WP.
Then you would not have problems with the weaknesses of the system which is the WordPress.

2) Update and security issues
With WP PM Pro in WordPress, 2 questions are:
a) Security of WordPress itself and the possibility of data leakage
b) WP PM Pro updates and its continuous development

3) The issue of speed, especially when the system is loading data.
As long as it starts with a pure WP PM we can organize that it will work quickly.
However, over time, when the data will grow and in greater quantity than on a blog in WordPress - the system is available and you need to wait 1,2,3 ... seconds to open the project, tasks, etc.

4) No mobile application.
I can't imagine working in today's world without mobile solutions.
So that we don't have the Android / IPhone application for Trello, Assana, Google Calendar, Gmail ...
I know, someone will say, you can always run it in Chrome on your smartphone ... but that's not it. You can't work in traffic.

5) No synchronization with Google Calendar, Microsoft Office 365...

6) No synchronization with other applications (IFTTT, Zapier)

7) Lack of one place where you can collect all tasks from all projects for me divided into categories (phone, shopping, car, delegated ...).
Something that Asana, Nozbe … or even Project.co has. So that I can continue to manage it.

Here in WP PM, you need to enter and focus on a given project, and you can't act on all of the collected data, tasks.

8) Inability to send tasks to the system in the form of an e-mail (something that has Asana, Trello, Nozbe ...)

9) I understand that it is more about WP PM being directed at programmers and webdevelopers?

But if so, then the unlimited sites/domains is missing, something people in Appsumo are asking for. There is now an option to buy more (10,20,30.…), but if someone wants to have such a set tied for longer, they would like to have unlimited availability (as in such in WordPress addons: Themeisle, Essential Addons for Elementor …).

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I am looking at WP Project Manager for now and maybe I will change my mind over time.
But I have a lot of fears so far.

For comparison, I have another solution that was here Ora.pm. I'ts work on incomparably optimally, comfortably, also to work in PM, Scrum, Agile ...

WordPress is a very good system as CMS, blog.
But not to force him to bend to Project Manager.

It will not be a reliable system such as Asana, Wrike, Trello.

Unless we implement or support it.
Work as support for implemented solutions.

These are additional problems on mind.
Do you want it or not?