It's not Edge if it doesn't have these features!

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Respectfully, I disagree.

TL;DR - Some of these features would be better served as add-ins instead of native permanent browser fixtures.

Looking back at the long term development of the original Edge, the entire development centered around the idea of a clean, "no baggage" browser -- one that would drop all dependencies to IE as it existed and create something new and completely clean.  They did start with that but deviated with some of the features you are asking about over time, and that has caused a bit of the bloat and some of the baggage that we now see.  Web notes and tabs aside were two features that were added after the initial concept.

However, even in disagreement I see a workaround possible.

The problems that I had with the features that I really had issue with (set tabs aside, inking) was that there was no way to remove those features from the UI.  Until 1809 there was no way at all to remove the oversized "Add a Web Note" or "Share this page" button from the UI.  I never used either.  Ever.  Many people I questioned answered that they never used it either, or used that exact point as one of the primary reasons for hating the browser in the first place - a lack of customization.

In fact it wasn't until 1809 that I started using Edge as my primary browser, because primarily of the increased customization.  It just FELT better.

So please, all I ask as a middle ground is if this is enabled at all it should be in the form of an addin that doesn't add to the baseline browser memory/compute footprint.  Or if it absolutely must be added to the browser, let users who do not use these features be able to turn them off.  

I never set tabs aside either, and understand that all of these things put together in Windows pre-1809 resulted in a heck of a lot of buttons that were always permanently on your screen.  UI Complexity and non-modifiability is a real turn off for many... believe it or not, vanity is important in this application -- the browser is one of the most used and most viewed applications.  I hear lots of goodwill about Edge/Chromium primarily because they're impressed their themes are also working from Chrome.