My suggestions for SSMS 21 are as follows...
A result pane needs some features to be productive apart from just listing data.
- Show result aggregates (sum, count, NotNull count, Null count, avg, min, max) on the status bar. This is long overdue.
-Option to sort column data (asc/desc) upon clicking the column header.
-Option to group data by dragging the column to a top-level like outlook grid.
-Optimize data loading time. As a developer, we work on different SQL editors and what I realized is that data gets displayed very very fast after query execution. But not sure why SSMS results take time to load data. This needs a serious relooking.
Dark Mode: Users have been "demanding" dark mode since 2017. If this is too hard to implement then at least start with 3 core windows i.e. SQL Editor, Result pane, & Object Explorer.
Option to group db objects in the logical folder. This will help us in managing related objects in a group of folders.
Optimize startup time: SSMS loading time is too long! It is taking more time to load than VisualStudio. Not sure what is happening behind the screen!