Original-Syn I was able to set it where you could pin multiple even if you pin one, then search for something else it will show the number pinned at the top. So you are not limited to just within one search result, you can pin across...
That's pretty awesome.
Regarding the devel packages: what if the search is less specific?
Excample: just search for svg
Here is deprecated Solus Software Center behaviour:



Between qt5/6-svg package and according devel packages are some 20 random other packages. The devel packages are not "grouped" with the corresponding package.
This had made my search for devel packages far more complicated than it should be in the past.
Edit: On the other hand it might be confusing for "normal users" to see devel packages at all.
So one might argue that in could make sense to have a default normal search that doesn't show devel packages, and an advanced search that also includes devel packages. But maybe I just overcomplicate things here.