Ro/Di units - drink waste water?

i think its totally fine to drink if i didnt go through the deionized stage because the water actually went through a series of carbon filtration before it enters the membrane and split off as waste and clean water. There are a lot of people that prefer filtered water over RO water for drinking.. and these filtered water just goes through a carbon filtration and into your cup.

 

But tap water filters don't add the additional TDS filtered out of the treated RO water. Not the same. You must consider the additional 25% of TDS added back. In my case in Phoenix with a tap water TDS or 800 adding the treated TDS back in makes it over 1000 TDS I would be drinking. Why would I want to do that? The idea is you have no idea what the TDS consists of to begin with, only that its electrically conductive and registers on a meter, now you add additional TDS to it and concentrate it further again not knowing what the TDS is composed of, I wouldn't drink it.
Carbon only removes chlorine and organics, many things pass through the carbon just like some things pass through an RO membrane, thats why we use DI as the final step. The waste will contain elevated phosphates, silicates, nitrates, arsenic etc if they are present to begin with since carbon does not remove them.