Diameter of pots is big, too. You get way more evaporation with a wider pot.

Ounces suck because they are used as a weight and a volume, and I can’t never be sure which one a particular recipe is using.

I think a major one is to try to avoid trusting in unfounded precision.

If you want to make lemonade like a chemist, you don’t just weigh out some lemon juice and add it to water and sugar. You measure sugar and citric acid content of the batch of lemon juice, then calculate how much water will dilute it to the right pH, and how much sugar will bring it to your desired osmolarity. In reality, no one is going to do that unless they run a business and need a completely repeatable. If you get lazy and just weigh out the same mass of stuff with a new batch of lemon juice, you could be way off. Better to just make it and taste it then adjust. Fruits, vegetables, and meats are not consistent products, so you can’t treat them as such.

If i were to be writing recipes for cooking, I would have fruits/vegetables/meats/eggs listed by quantity, not mass (e.g., 1 onion, 1 egg), but i would include a rough mass to account for regional variations in size (maybe your carrots are twice the size of mine). Spices i would not give amounts for because they are always to taste. At most, I would give ratios (e.g. 50% thyme, 25% oregano). Lots of people have old, preground spices, so they will need to use much more than someone using whole spices freshly ground. I think salt could be given as a percentage of total mass of other ingredients, but desired salinity is a wide range, so i would have to aim low and let people adjust upward.

Baking is a little different, and I really like cookbooks that use bakers percentages, however, they don’t work well for ingredients like egg that I would want to use in discrete increments. For anything with flour, I would specify brand and/or protein level. A European trying to follow an American bread recipe will likely end up disappointed because European flour usually has lower protein (growing conditions are different), which will result in different outcomes.

I will say in defense of teaspoons, most home cooks have scales that have a 1 gram resolution, though accuracy is questionable if you are only measuring a few grams or less. Teaspoons (and their smaller fractions) are going to be more accurate for those ingredients. Personally, I just have a second, smaller scale with greater resolution.

Seconding the national center for home food preservation document.

One thing that I like experimenting with that i have to search for every time is the time/temperature curves for pasteurization of different foods. Every “knows” you are supposed to cook chicken (and most “prepared foods”) to 165 °F according to the FDA/USDA. What most people don’t know is that that temperature is what your food needs to hit for 1 second to have the proper reduction of bacteria (e.g., 7-log for chicken, which is a really high bar). You get the same reduction with 15 seconds at 160 °F or an hour at a little over 135 °F. You can easily do that with a sous vide bath.

It’s really cool for people who are immunocomprimised or pregnant because you can cook a steak to medium rare, but hold temp for a couple hours, and it’s just as safe as if you cooked it to way hotter and ruined the meat. You can also do runny egg yolks.

Here’s the first link that came up when I looked for it, but I’m sure you could find the actual government publication.

https://blog.thermoworks.com/wp-content/uploads/2019/07/RTE_Poultry_Tables.pdf

Why would you want anything by volume? Mass is so much easier. 50 ml of honey is way more annoying to get into a recipe than dumping it right into whatever container the rest of the ingredients are in while it’s sat on a scale.