Sorry, I am expanding my opinion, which I could not before.
I couldn't agree more.
Possibly, the one who learns in a regulated system, with teachers, etc...., is not so prone to fall into that error.
What I did, at the beginning, while I was learning harmony (all tonal and classical, and then I started to move on to contemporary systems) is to compose either for a solo instrument or for the piano.
Even then, it took me years to start writing for piano idiomatically. That is, to write things that were real (playable), and that sounded like real piano, not a continuous mashup of block chords or arpeggios or whatever.
At that time I started to study counterpoint, for which I took an official course as a starting point and it helped me a lot.
Little by little I was writing things for piano and another instrument, or two.
With string quartets I haven't dared yet.
Because whenever I use instruments I always study how they work, their ranges and what they can do. But it's not the same in an orchestra as it is as soloists.
And so I started to study orchestration and did my first things with small orchestras first and then bigger ones. And I'm still learning, of course.
I also see a lot of people who upload large-scale works without mastering the basics. It's not a matter of putting things up and filling them out....
The very process of learning little by little is fantastic.