Hi Paulius,
This is a good question and one I've come across a lot. There's a lot of messages out there about quality of content, length of content and keywords in content, but I think the purpose of the content is being lost on people. The purpose of content should always be information that is useful to the searcher.
That might mean a 2000 word page, or 4 x 200 word blog posts, a slideshare presentation, an infographic or a 5 minute video. It's really up to you to decide who this content is for and what's the most useful way for you to communicate it to them. If in doubt, check out what other people are doing and what their engagement is like. If you see 2000 word article with 2 shares vs a 5 min video with 70 likes, the video would be the better option... but you might not deliver it right! Experiment, test, get advice and see what works for your brand and your content.
The best content strategies are the ones that are consumer-centric, not search engine-centric.
Stel