This is an interesting read, but it's almost ironic because over the last decade, the argument between MIT and GPL has become less important, IMHO because of the rise of SaaS. And by that, I mean, that we've seen a recent push back towards both Apache and GPL licenses from companies that take umbrage with other companies using their source code to sell hosted SaaS versions of their work, without contributing back. Of course, the problem is that the GPL doesn't solve that problem any better than BSD or MIT or Apache and it is debatable if the AGPL does either. The fact is, modern OSS/FOSS licenses really weren't designed for the age of server-side software where there isn't a distributed client or locally compiled code.
And while I'm incredibly sympathetic to companies who see Amazon and others (and disclosure, I work for Microsoft but my opinions are my own and I don't represent my employer) using their work to sell hosted versions of their products that directly compete/undercut/undermine their core businesses, that's also just a natural side-effect of using an OSS license in the first place. If you, as a business, are unable or unwilling to account for that possibility, perhaps you shouldn't have used that license to begin with. It seems unfair and wrong to attempt to relicense or reframe the rules after you have already benefited from the source used by others, which is why I look at things like Common Clause with disdain. Own that you are proprietary or GTFO, don't try to do this bullshit middle-ground approach, which doesn't do anything.
So in a SaaS situation, MIT vs GPL is irrelevant, and yet many of the renewal of licensing discussions are around those ideas.
My personal philosophy around open source has also shifted over the last decade or so, but it has largely cemented why I personally prefer BSD/MIT licenses. Having said that, although I prefer BSD/MIT licenses, I'm also of the opinion that in many cases, it is beneficial to everyone to contribute changes back to the main projects. Period.
I used to be much more in favor of proprietary software -- or, at least the right for a developer to choose to make some or all of their software proprietary. I still believe that -- because even though I would argue that open source is often a better development model, I'm not in favor of the FSF POV that deems all software must be free. True freedom means the ability to do things that are not in the interest of the public or maybe, even ultimately, the developer herself.
My position has changed insofar as I now think that the business case (and not just the moral/ethical case) for FOSS or OSS is stronger -- but I still feel strongly that aspects of the GPL make it overly cumbersome when releasing software. My feeling has always been, if I choose to make my code available, I'm making that choice -- I would like you to choose to contribute any changes back. It would probably be better for everyone if you did that -- but I don't want or need reciprocal access to any code you use alongside what I wrote, and I don't feel you're obligated to share any specific changes back with me. If I wanted to enforce that someone has to pay me for my work in order to potentially profit from it, I would need to make my work proprietary and sell it that way.