[john-aj]

>In German you need to have that noun info upfront, otherwise you might not get the grammar correct!

In reality, (1) people rarely change their mind about what noun they're going to use such that the gender is different, and (2) when it needs to be done, speakers of German either ignore it or just go back and repair what they said, changing the forms of the determiner and adjective. Germans speak with no more planning than English speakers.

One might say the same thing about certain English grammatical phenomena. When asking a question, you have to consider whether the subject is going to be singular or plural: Is/are the dog/dogs hungry? This isn't needed in languages without subject-verb agreement, such as Swedish. But it makes very little difference to native speakers.

[gus_massa]

I agree. Is Spanish, chair vs stool is a better example because some objects are in between and you may change your classification on the fly.

People will ignore the error most of the time unles you make too many of them. In that case they will assume you are a foreigner and ignore the errors anyway.

[LouisSayers]

It's not so much about changing your mind, but rather more that as a learner of German, you have to do a bit more upfront thinking, and be more considerate of the thing you're talking about.

For example, "can you pass me the X" is straightforward in English, but requires a bit more thinking / planning in German where you have to consider "what gender is X, and what case is it in?".

Of course for a native speaker this is for the most part automatic. For someone learning though, it emphasises objects in a way that you didn't have to before. All of a sudden every item is distinct, has an additional attribute and must be used in a specific way.

[Pamar]

My native language is Italian, which also changes suffixes based on number and gender.

(And I live in Germany since 2014 to boot)

I really think you are trying to draw conclusions about something that happens when learning most if not every language.

Example for English: https://www.gingersoftware.com/content/grammar-rules/adjecti...