The argument seems to be that people pay more money for products they find more convenient. That's true, but I don't think it's a problem by itself: it's their choice how to spend their money.
The problem would arise if the more convenient choice also externalized in some way: if it hurt other people, or the planet, and so on. There is some vague idea that throwing away a cartridge "produces more waste" than throwing away a razor blade alone, which may be true, but the difference between them seems like a trivial amount, as does for that matter the total share of waste from all shaving cartridges put together.
In other words, I don't see the harm; shave however you want.
The problem would arise if the more convenient choice also externalized in some way: if it hurt other people, or the planet, and so on. There is some vague idea that throwing away a cartridge "produces more waste" than throwing away a razor blade alone, which may be true, but the difference between them seems like a trivial amount, as does for that matter the total share of waste from all shaving cartridges put together.
In other words, I don't see the harm; shave however you want.