I actually wrote a separate article about this here. In your specific case, I would say that the main disadvantage is that your handwriting will not make intuitive sense for native speakers, and native speakers’ handwriting won’t make sens to you. If you think of 口 as one stroke, would you be bale to read a rapidly written 口 that has the right stroke order? It looks like the number 12, roughly. which makes zero sense if you don’t know stroke order! See this image, second line, last character. Naturally, this is just an example. If you ignore stroke order in general, this will cause problems. This particular character? Maybe not so much in practice.

What are the advantages following the stroke order? We can focus meaning and pronunciation rather than order of the stroke?

Yes, it can be very hard indeed. Some people are subtle when correcting foreigners. They might repeat what you said, but with the right tones and expect you to understand that you got it wrong the first time.

However, I’ve recently noticed that sometimes I think that people are correcting me, but when I ask them directly about it, they say that what I said is perfectly correct and that they only repeated it because they agree!