I’ve been using reading mode for about 10 days now, and I’m really happy with that.
Before I was just translating first hit but now I have 2 additional hours of reading
Personally I still do filling in. I could recognize easily なくてはいけない、なくてはならない、… but the fact I start to be able to write those quickly is because I trained them 
Of course, it means I have the synonym hells. To be honest, I memory the hint → structure, then I just look at what is around (is it a noun preceding ? a verb ?) to infer if I need some nominalization, etc etc, then I write the conjugated answer.
I think it’s quite important to write yourself to fully graps the small differences that make nuances. That’s also how you learn exception the best, for example by failing to recognize godan verbs that looks like ichidan (走る, 走って).
Also, sometimes it’s quite important to know if the past of している is したいる or していた。I think If you just recognize things, those 2 patterns might triggers the same recognition patterns, while in fact not really know example the difference.
Of course, I illustrate with easy examples, but latter there are more and more subtle things that need to be acknowledged/practiced, for example when to put お in humble form, etc
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There is an option to complete Bunpro with reading mode, and then change to fill in
I changed my reviews to “Reading” right now. It’s my second time going through the n5-n3 points, I feel I already trained writing stuff like なくてはいけない enough, and trying to guess if the writer wanted instead なくてはならない、なくちゃいけない、なくてはならない、ないと、なければいけない、なｋればならない doesn’t feel like a good way to spend my time. If it was not a good idea I report here, and going to n2 and n1, I may or not change it back to Fill In.
I think this type of thing will come naturally 
I also feel this way.
The real challenge is building long sentences and the structure within them.
So ye, after doing n3 fully in reading mode I think it’s the way to go, and then just write something, take mistakes, and then to Anki or do those topics with cram focusing only on mistakes and needed points.
At least for me it feels this way