The term 'dry' is a little misleading. The moisture level our substrate comes out the bag at, is dry. Coco and soil comes as dry as you ever want it to be. With few exceptions, like it was stored in the rain. If we let our substrate go as dry as your clothes from the drier, then dissolved solids become hard deposits. Deposits which may never dissolve again. Parked up on the substrate effecting it's cec. This 'fixation' isn't desirable.
If your a bit of a science geek, rather than green fingered, then the weighing approach may suit you. Pot up your plant. Weigh it. That is when you water next. Though the weight value will increase as the plants size does, you get a lot of insight regarding their daily intake from weighing. So you know what water is needed for 24 hours.
As an example, a 5" pot might weigh 300g holding dry coco. First day in that pot size, I would water them up to 400g. Second day, the information is coming in. Anything over 350g still, doesn't want water. Anything under 350, is telling you what it needs. So day 3, they all sit at 300g come watering time. A 5" pot of coco will produce runoff around 550g. So once a plant actually needs 150g of water a day (taking to 450) then it can be moved to the 'water till runoff' group. No more weighing. You won't drown it.
If you do drown one, just water more using hydrogen peroxide. Remember it's the lack of oxygen that's really the problem, not the quantity of water.
Most scales don't mind you tipping water over them. But cheap one's are still best, and ones that use AA batteries, because nobody has spare button cells