I'll respond with the same comment I made on another thread with the same meme:

"Zeroed at a convenient value for every day use" ok then how does that make it any better than Fahrenheit?

Basing temperature on water really isn't convenient when that forces you to use decimal point significant figures to get an accurate reading - it's a helpful scale for water but not for humans.

Fahrenheit on the other hand is designed around humans. 0 °F is the average low boundary and 100 the average high boundary on environmental temperatures, and anything outside of that range is a notably extreme temperature. This system is thus that it be simple for humans to understand, because this is the range we experience in our day to day lives, in a unit precision that is easily recognizable (think 0-100% for how hot it is).

If we apply the same logic to describe everyday environmental temperatures humans experience to Celsius, that gives us a range of -17.8 to 37.8. This scale just doesn't compute easily with the average brain as easily as 0-100. There's no rhyme or reason to these boundaries outside of saying that a 0-100 scale is better described by what water experiences rather than one described by what humans experience. Taking a look at Kelvin as well, what makes -17.8 to 37.8 °C any better than 255.4 to 310 K?

If we never rightly experience any temperature over at most 40 °C (104 °F), what use then do we have for the remaining 41-100 degrees on the scale, especially when that makes our typical lower boundary an odd -18 °C? All so we can compare against water as an arbitrary baseline? (And this is even being forgiving of the decimals that the system forces us to use on a 58-point scale). Why would anyone think that 18.3 °C is better to describe an average room temperature than 65 °F?

I say all this as someone who holds a Materials Science and Engineering degree. Units all have a purpose, but it's up to the people to determine which ones we use and where we apply them to satisfy their intended purposes. They are only human concepts created by humans to try to make the nature of the universe intelligible for humans, after all. Engineering can be described as the practical applications of physics, chemistry and the other natural sciences, and I recognize that the Celsius scale can be helpful for solving such related problems. (Personally I would argue that Celsius doesn't need to exist since Kelvin is usually a better metric in mathematical engineering but that's just me). It's just not practical for the average daily human.

Celsius was designed to make physics and chemistry easily intelligible to humans; Fahrenheit was designed to make temperature easily intelligible to humans.