I don't think this is the case.

1. If you accidentally say There is and want to use a plural after, (for example, a lot), you can just say a number in between. The sentence stays correct, you just have to say 2 additional words. I personally never had this problem

2. This is internet. You are free to edit your comment and reread it a million times before posting

Hope you understand what I'm trying to say, not being native sometimes restricts my ability to properly articulate semi-complex stuff

You have very strong opinions about correct English for someone who doesn't speak it as a native language.

Those are not opinions, I am handing you literal facts

These are all things people can do, but might not be in the natural flow. Any it depends how the person is speaking. To use a car analogy, a driver can either be looking far ahead and flowing smoothly or looking only a short distance ahead and having to make lots of awkward adjustments. I personally go back and edit things most of the time, but that takes more time for only "style points" in most cases.