Should speakers be upgraded before preamp and amplifiers?

I try to follow this for next purchase decisions.  Where am I at with everything else and what am I looking to accomplish?  Just a different flavor or are there still basic needs to cover.

https://gr-research.com/priorities-for-proper-system/

Speakers first. You want to mate them with complementary components. While given whatever speakers you choose it is most important to mate with appropriate amplification... the preamp can maters. For instance if you get hyper detailed speakers... you don’t want a lean hyper detailed preamp... mating is very important.

Tube preamp, definitely. This is the component that is really largely influential on the musicality and naturalness... get this one wrong and everything will not sound right. So choose a good tube preamp.

I'm a believer in building one's system around the speakers. 

Absolutely speakers first. Find some you really like the sound of at resellers and friends.  Notice what they’re paired with at careful listening can shape your component decisions also. One of the things to recall about speakers is that bookshellf speakers with stands take up about as much room as floor standers. Bass reproduction desires could steer you towards floor standers too.