Structuring/Planning a project without "Start" / "Finish"

Dear reader,

occasionally I go back from my daily Software-Projectmangager practice to read some theory.

Once again, I stumbled on a link like this:  https://www.mpug.com/articles/3-incorrect-ways-to-do-scheduling-with-microsoft-project/ [1]

especially at:  DON’T Use the Start and Finish Columns. 

To be honest:  I do not understand it.

To give you an simplified idea on what I am planning as SoftwareProjectManager:

a) I get a SW-Project to plan    b) I break it down in a WBS    c) I calculate costs, assign resources,.... and more    d) I do a realease-planning

Finally, my MsProject-Plan looks like this:

1. Delivery/Release 1
   1. Create this component       by Resource 1         from  5.April to 7.Jun4 18
   2. Create that component      by Resource 2        from   8.April to 20.April 18
   3. .....
2. Delivery/Release 2

1. Test this     by Resource 4         from  15. July to 20.Aug 18
2. Test that     by Resource 3        from   20. May to 25.June 18

This is basically my approach.  But now, "this link" says:  To NOT fill START and FINISH.  Instead, "Link tasks together". And: My Releases have a fixed due-date. They should not be floating !?

Do you have any first idea/link/explanation available for me ?