Is it?
A Milwaukee drill is physically heavier than a Ryobi of the same size - purely because of all of the upgraded components to make it more durable/longer-lasting.
But if you are only touching 5% of the expected lifespan of your tool, no need to have one that's over-engineered.
1. is the milwaukee doubly-engineered compared to the ryobi? because if you end up with 2 ryobis, that's twice the material/energy input of the one milwaukee
2. you seem to be ignoring the possibility that the milwaukee is "so" over-engineered that you pass it on to someone else, greatly extending its effective lifetime.
If I was a professional or ran a tool rental business I would 100% agree. But I wouldn't buy a pickup track no matter how durable if all I need it to do is grab groceries. It's better to get a tool engineered for the level of work expected.
If nothing else, there are various kinds of wastefulness: money, pollution during manufacture / delivery, landfill, opportunity costs, etc.