Unified Inbox in Outlook 2020?

I develop in the Microsoft world.  I also was a mac switcher and have multiple email accounts.  Mac outlook was much better than windows, I can't believe that their flagship line of products for the PC doesn't have this function.  I am using some third party clients that support it (emclient/mailbird) but both are a little wonky/buggy at times.  I have also published here the same thing to no avail for many years.

I've been in the same, or actually worse situation for years.  Having multiple email accounts from several customers but no way to switch to Mac as 99.9% of my job has been and is tied to Windows.

Anyways, long story short.  Few years ago i found myself an alternative - eMClient.  It does come with a price tag but as far as i see it's well worth it.

You must only be using POP3.  There is no ‘Change Folder’ option with IMAP accounts.

An alternative to Thunderbird has been a recurring quest of mine for years, and I returned to it this evening.  The unified inbox thing has been a big hangup with Outlook, so I came across this thread.  After experimenting a bit, I seem to have found a satisfactory solution, but feel like I must be missing something, given the other comments and the fact that I didn't find this answer anywhere.

If I go to Account Settings and click on the Email tab, I see a list of all the emails I've added to Outlook.  At the bottom is a "Change Folder" button that corresponds with each email address as I click on it.  From what I can tell, I can use this button to send the mail from all of my email addresses to a single inbox.  So, I pick my default Outlook address, which doesn't receive any mail, and all of the emails from all my addresses go to that inbox.

Furthermore, it looks like as I go through those emails, if I hit reply, it automatically replies using the correct address.  

So, basically, whatever email address I pick as the default, I just send all addresses to that inbox, and that becomes my unified inbox.

Is there some reason this isn't a workable solution?

emclient looks like a good option to solve PC outlooks untenable missing feature of unified inbox.  Is their one off price (€35) for a perpetual license?  Are there any obvious missing features? E.g. does it support meeting scheduler for exchange accounts, sync email/contacts with gmail and/or exchange, signatures etc?

Another massive missing feature in outlook (mac version at least),  is sounding an alarm when a meeting starts.  On mac, you just get an almost invisible popup in the corner, which I never see, and one beep on my phone 15 minutes before which I never hear

• so I miss around 90% of my meetings. I have to spend my entire day constantly looking at the calendar for when the next meeting is coming up, or setting alarms in my phone for every meeting of the day, which is incredibly tedious.