If you can easily pass for part of a plant, it's pretty darn effective. Especially if you live where most plants stay green all year. Except it doesn't work on invasive ferrets, stoats, and rats who eat the eggs.
Most adults I know who study a foreign language do so in order to speak it, perhaps visit that country. In languages that build words from letters, the phonemes are important to meaning. Obviously "heresy" is very different from "hearsay," but sow and sow are different words that sound different, while sew and so are also different but sound the same. It's especially important in order to appreciate literature, poetry, music, and jokes.
Personally I cut cubes first, makes freezing and thawing easier. Drain but don't press. Spread in a layer until frozen, then you can put into a bag or container.
When English-speaking kids are taught to read, and to spell, it's very much an out-loud process, using phonics, and methodically covers the various pronunciation of all the letters' sounds. "Sound it out" is the first step in decoding written words. Then of course there's using context clues to figure out what word you've heard before could be spelled using those letters' possible sounds. And it's not until later, once all the common rules and exceptions of pronunciation are automatic, that you start "reading to learn" and attempt words you've never heard before.
Tbf, you're not wrong about the inconsistency of English, it's because we stole words, phrases, entire dialects from so many sources. And sometimes we kept the original pronunciation, other times we rudely imposed our phonetic expectations of the time and place when we stole them. Also the "correct" pronunciation for many words is different in different English-speaking countries.
On the plus side for you, that means most people are pretty lenient about what we consider "fluent," and make allowances for accent. Unless they're a racist asshole in the first place. When you mispronounce a word because you're following phonetic rules but that word breaks them, most of us can recognize that version because we did the same thing when learning to read.
If you can easily pass for part of a plant, it's pretty darn effective. Especially if you live where most plants stay green all year. Except it doesn't work on invasive ferrets, stoats, and rats who eat the eggs.