Microsoft
HowardCrow It is not my opinion only. Look how IT press describe this situation. https://www.theregister.co.uk/2018/09/28/microsoft_project/ The Register have 10 millions unique visitor per month according SimilarWeb. The Register agree that MS Project Server 2019 LAST version of the product. It is conclusion from yours post. May be you say more than need. However if vendor declare statement that MSPS don't have all new features of PO it is mean stop development of the product. If the vendor declare statement that PO will have only security and performance improvements it is mean that the vendor stop development of the product and keep support line only. Now MSPS/PO in same situation as "long life" Windows XP with extended support. But it is obvious that Microsoft management prohibited any situation with internal competition Microsoft products. Only MSPS/PO or Project Service should survive. We know who :)