It's true that Big Tech are not the most innovative companies around
The linked article is about the many shortcomings that Google Password Manager has, and it is quite true that many of the dedicated password managers out there have way better features than Google has.
It was for the same reason that I never used Google's Authentication app at all. The same went for their passkey management.
Many Big Tech companies have millions or billions of funds to throw at buying out their competition, and to cobble products together. The reason they buy out their competition is, because the competition has something better that they cannot just use, unless they buy the business and own the patents. Often they even kill those products off, or they neuter them (like the original peer-to-peer Skype) and let them die off.
Big Tech is no friend of innovation, and can use their financial (and other muscle) to kill off the competition. Anyone still remember the early days of Microsoft Windows when the deal was struck for discounting Windows with new PCs as long as the manufacturers only pre-installed Windows? I remember a government department having to also pay for Windows licenses for all their Linux computers (which had no Windows installed on them) because the licensing deal was “all” PC's irrespective of what OS was installed. This all helps us understand how the “Big” came about in Big Tech...
But I digress, the point being actually Big Tech is really not that good at innovating, and this is especially true once their own founders have departed the organisation. Their founders were often the ones who were innovative (OK, excluding Microsoft) when they started out themselves.
See
6 reasons I gave up on Google Password Manager 
Google Password Manager works, but it's just not good enough for me
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