I’ll start off by saying that my reading ‘style’ is sort of hybrid: I aim to read things I can mostly understand, or guess by context, but will stop and look up kanji or grammar if it feels like they’re particularly important (and I’m really not getting them). I mostly read manga, so I do have フリガナ to make that searching much faster and easier. Stroke searching is hard and I am just a poor creacher
I definitely think reading is helpful for reinforcing learned grammar and helping to familiarize you with new grammar.
(I don’t say learn because I, personally, have a really hard time parsing out a grammar point’s meaning if I well and truly have never studied it before – but it can help me see the pattern of how it’s used, so when I do study it I’ve got a head start. Looking at you, わけ. Additionally, if there’s a grammar that I have studied being used in a slightly different way, I can sometimes manage to make sense of that by context.)
However, it’s also quite hard to get into reading if you don’t have a certain level of grammar under your belt; and when you do read, it’s important to pick something that is within your current level. Like, really important, because bashing your head against a story that’s too advanced for your current level is just going to burn you out. And for me at least, it’s also important that I read something I’m interested in because otherwise my focus flags reallllll hard.
Personally, I’ve been using manga to help bridge that gap – especially by re-reading manga I’m already into, because then I have both guaranteed interest AND additional context to help me parse out words and grammar I might not know yet.
Kind of both at once, at least for me. Reading is a good way for me to practice with kanji and grammar that I’ve studied, because I can come across them and go okay, I know this, now how does it work in this specific sentence? And it help me to not only practice, but to see it used in a more natural, non-study setting – which can offer context or nuances that don’t come across well when you’re just studying a word or grammar point on its own. In addition, it provides you the opportunity for something I find very, very validating: that moment when you go “waIT I STUDIED THAT YESTERDAY I KNOW WHAT THIS MEANS NOW”. For me, that moment is really important in helping to maintain motivation. We’re unfortunately choosing to study a very difficult language; it’s important to remind yourself of progress in any way you can, no matter how small.
But other than reinforcement, reading can also introduce something new, like if I come across a vocabulary word that I have to look up – and yes, I almost always wind up looking up a word more than once. A lot of times I do re-forget it, absolutely. But what this basically is doing is acting as SRS in it’s natural form; see a thing, learn the thing, try to review the thing again later. Sometimes it’s been too long and you have to re-learn instead of reviewing.
Eventually, though, the word will ‘guru’, so to speak – at least for me, I’ll hit a point where I go “Oh I know this one, I looked it up, what was it what was it- OH YEAH” and then I can keep going, and when the word shows up again that “OH YEAH” will come just a little bit faster. Again, it’s basically the natural form of SRS, just without the structure WK supplies.
The other thing that helps this is reading the same genre. In my case, my current practice manga is 名探偵コナン – which does mean I’m learning a lot of murder mystery vocabulary, to be fair – but because I’m following the same series continuously, I see the same sort of vocabulary or verbal ticks and get that natural SRS effect ever time I come across them in a new chapter. Because it’s a manga, I have those visual queues to help with guessing context. And because it’s a manga I’ve read before, I’m interested and I know some of the plot already, which again helps to provide context/support so that I don’t have to look up quite as much.
Finally, something you’re getting out of reading is the ability to read, and I’m not being sarcastic about that. Sitting down and looking at a big wall of Japanese can make your brain shy away (or at least it makes mine, sometimes) but reading practice teaches you to sit down and work your way through it, even if that might be at a pretty slow pace at first. The more you do it, the faster and smoother it gets.
TLDR; Yes, reading helps to both reinforce studied items and learn new ones, but it takes time and can be frustrating. Make sure you’re using something that fits your level and interests you to minimize the frustration, and know that eventually it will get easier.