TDS is non descriptive truthfully, it does not tell you what the dissolved solids might be.

Some plants appears sensitive to KH, but not to TDS, unless the TDS is due to KH.......

See?

It's better/best to be as specific as you can and give specific details, such as a 20ppm to 100ppm of NO3, rather than these bozos that say high NO3 is bad.

What the heck does high NO3 mean?
5ppm?
50ppm?
500ppm?