We are talking about one of the richest companies on the planet that makes by far the largest margins on their laptops and desktops in the industry. If any company is equipped to offer 32 bit legacy support for the benefit of their users it is Apple.
First I would like to say that I feel why you are frustrated, but the party to blame is whoever made the 32bit-thing you are using now, they refused to pay their technical debt. They should have moved to 64bit long ago to avoid frustrating you when this eventually happened. I am also genuinely curious what 32-bit software you depend on, would appreciate if you mention which software/company it is.
On the other hand, yes Apple has great margin but companies are not charities, they don't stop making money when they have "enough". When they make more money than expected, their stock rises, they pay some dividend, CEO gets a nice bonus and everyone gets back to work to figure out how to make even more money.
You can argue that Apple is already charging a premium to be user friendly, and 32bit support is also an item that can count as being user friendly. That would be a valid argument.
Actually this might be the reason they are only now stopping it and have been ok with supporting it until now(2019). Similarly there is a reason Apple computers don't have CD-ROMs anymore, this is because the vast majority of their users, don't care about CDs at this moment, the industry has mostly left it behind to better alternatives, those who have not(think medical devices that are expected to be function for 50 years because they are expensive) make support agreements for 20 years or something with corporate friendly manufacturers/developers such as Oracle and Microsoft etc. or just write their own OS that no one can deprecate. See how Redhat Support of Python 2 for example, Python 2 will be ancient on January 1 2020, but Oracle needs to support it because that is how they make money, being very very reliable in terms of supporting stuff. [1]
Finally actually Apples' profits has been dropping as far as I remember because of decrease in iphone sales year over year, so they need to do something to cut costs and get back to the "largest margins" you mentioned again.
That's not the point. Apple gave every developer ample time to update their software. This has been in the works for years and there have been 2 major OS releases that specifically called this out for developers.
