I dislike those arguments, not because I disagree with your conclusion, but because it's what's known as a generalization argument and those sorts of arguments leave a bad taste in my mouth. For instance, it's not okay for me to be an engineer because if everyone was an engineer then no other jobs that would be needed would be completed. This is why it's considered to be fallacious.
The ethics of intellectual property is pretty straightforward. You don't need to use any justifications for why people should be permitted to sell their intellectual property in the way that they choose, I mean it is property that is owed just like a house or your car, which can be licensed out.
But what's failed to be mention is the actual rationality or effective business strategy of such a system. Going after a bunch of individuals who probably otherwise wouldn't be able to afford or don't really have a lot of money to use your system is a bad business strategy for Microsoft. Some companies (Disney, Apple, Nintendo) take a very hard stance against anyone infringing their IP (or ironically their hardware they sell to you), while others (Adobe, Microsoft) will mainly only target people who have become a problem. This is part of their business strategy. It's really not up to you decide how companies should enforce their IP since it's their IP.
A defining difference between these companies tends to be the business market interest of their product. Microsoft makes a literal killing off of its business suite products and so does Adobe. So do they really care all that much if some young kid is using their product didn't buy a $100 license? Not likely provided there isn't a great deal of them. And for software specifically you could try very hard to lock down your software Denuvo style but it's likely to get defeated anyway and you'll have spent millions of dollars in development costs trying to do it. And litigating these people who are difficult to track is too difficult. This makes it uneconomical to do. This is what I mean by a bad business strategy. Businesses want to turn a profit and when managed correctly, they avoid actions that would result in sinking money into something that would only generate negative PR and net a negative return on investment.
For companies like Apple and Nintendo, the consumers are their demographic, not enterprise level customers, so they have a stronger interest in preventing customers from obtaining their software free.
And you won't see me shedding a tear for the most profitable company in the world that has more money than they know what to do with and reached that state through less than ethical business practices.