I'm sorry to say that Microsoft isn't improving the flaws and errors in SQL Serve
What for flaws and errors? I haven't got one in the past 25 years I am working with SQL Server.
I also need Microsoft to remove the 4,000-character limit for SQL queries.
If your queries are that large, then there must be something wrong with your database design and the resulting queries.
I never-ever nearly reached that limit ... in the past 25 years.