There's a story of a famous observatory that, iirc, kept on seeing really powerful intermittent signals that they couldn't quite hone in on. It seemed everytime they tried to zoom in on the source they couldn't find it again. Signal was quite elusive.
They finally traced it to people using the microwave in the break room in a very specific way. Some people liked to open the microwave door before the timer went off. The microwave stopped, of course, but there was a split second where it was still emitting while the protective cage was opened, and the energy that leaked out during those couple of ms were enough to screw with the observatory equipment.
Aliens? Nope, just some tired grad student reheating their coffee.
Believe me, I'm as angry about this as you will be, but TIL that the correct term is "to home in," which makes sense, but nowhere near as pleasing, or visual, as "hone in."
Writing and speaking are effective at establishing long term memories, it's why we do it for other things, but a language learning beginner has no idea if what they're writing makes sense or if there's any subtle mistakes in how they're pronouncing words or how they're putting them together, etc.
Language learning experts don't recommend you start speaking/writing unless you have a coach or have reached an intermediate level so that you can discern when something sounds native or not. That way you can self evaluate with recordings, etc.
It is an effective tool for learning, but for self-learning you're gonna be shooting yourself in the foot long term. You should only do it if you have, say, a partner that speaks the language and doesn't mind correcting you all the time.
For Japanese I recommend that you do learn how to write kana/kanji from the start, and even some vocab if you want. But stop there. Don't write sentences, don't try to talk to japanese people on those apps/discord etc. and wait until you're at an intermediate level to do it, otherwise you'll form some very bad habits that are very hard to undo.