The Luddic church is an institution of immense piety compared to the rest of the sector, standard architecture in the sector is extravagant so it would make sense for the church to want more simplicity, especially a church *against* technology and extravagance. Their ships look simple, their outfits too, their structures should also be simple. The presence of God is only in places where the presence of Man is weak, extravagant churches go against that, frescos, statues, it all goes against that
(lol at telling the guy who writes the lore what the lore is)
Though more seriously - as you pointed out, the luddic rejection of technology is
in relation to the rest of the sector, by our standards they'd still be using wildly advanced technology (for instance, one of the skulls in the version of the first image that david posted to twitter has what looks like an implant in it's skull, the knights use power armour, etc) & it makes sense that the relatively mundane tech would get used in their architecture (and allow for fancier structures).
And well, since you're comparing the luddic church to the catholic church, compare st. peter's basilica to say st. albans' cathedral or a local church; the more "central" places of worship are (by necessity) larger and (because the clergymen who run the place want to look fancy) more impressive. This tracks pretty well onto what we can see of the illustrations (imo), the shrine on hesperus is kinda small and out of the way, it's more of a military base than anthing- while the shrine on (probably, given that it's a nice looking world) gilead is a much larger affair that presumably gets many more pilgrims & has to accommodate for them.
There's also, y'know, this bit from the blogpost that effectively excuses the differences, every shrine is different, each one will adhere to the principles they see fit and in ways that they see fit.
Back to Luddism: no religion is a monolith of belief. Keeping doctrinal purity, particularly over interstellar distance and across borders, is like building a tower out of dry sand. It’s a constant effort to pull outliers back into line, and meanwhile all sorts of people keep finding all sorts of ways of relating to and interpreting the tenets of the Luddic faith.
Shrines give us a way to show this: each shrine is on a different world with its own problems, factions, and people, and themes.
and re: the actual content of the blogpost - this is all great stuff, it's lovely to see that the two most "nothing" factions (SD & LC) are getting some much-deserved attention! though, ngl this has me
almost worried that the PL is gonna get kinda left in the dust, but eh, they've still got some interesting stuff going for them.
time to go back to my regularly scheduled "longingly looking at the retribution's sprite", I can't wait to play around with it!