Totally agree! One of the devs had the same opinion and created a mod for builtin beacons. Those assemblers are pretty fun to build as well, and pretty expensive as they require the equivalent resources of a fully beaconed assembler.
See the second part of https://www.factorio.com/blog/post/fff-336 The link to the mod is in there as well.
Keep it low and maybe make some sort of book to educate them. Maybe 1 per minute. https://www.amazon.com/Diamond-Age-Illustrated-Primer-Spectra/dp/0553380966