As is so often the case, there's a lack of actual engineering in software "engineering". SPAs may be faster to develop and more performant or they may not. But simply declaring it to be so is not engineering. Extensive time is needed to make that determination and it must be based on an objective analysis of collected data.
SPAs faster to develop? We might live in different universes.
This mostly applies in cases where the developer doesn't have good experience with SSR.