I think I have an idea. There is a problem with
the fact that the Grounders are not the ones to tell their story or participate
much in it. Their history, where they came from, what made them what they are:
all of this becomes a convoluted puzzle for Clarke/Jaha/Skaikru to work out, so the
story becomes theirs, instead. It’s their adventure/journey toward ‘understanding’ and ‘overcoming’. Grounders are not the
main players here. They will never be the protagonists in their own play. 

It is awful because of the mixed messages against technology
and the colonialist themes, and how that could have been coordinated more
carefully around The Commander/The Flame.
Lexa should have Known Things. The Flamekeepers like Gaia should have
more agency in the secrets they are there to protect (secrets they don’t seem to know much about – but give an Arker five minutes and it’s child’s play). Indra is just there to be
almost mindlessly angry and guard the door?
Meanwhile, three Skaikru – men – get to play Hero and find the Highly
Unlikely Safe Space That Was There All Along (one of the most ridiculous plot
threads they’ve spun out).  

[And what is it with Jaha’s storylines, anyway?
He reaches earth strapped to a missile, goes searching for enlightenment and
finds an AI that just so happened to have caused the apocalypse (how
lucky is that), becomes her puppet, is sent out to draw people into a virtual
reality platform that is supposed to save them (in digital format) when another
round of deadly radiation hits their side of the planet (what IS causing the
blast, eh?), returns to Arkadia and seems to have no regrets over what he
participated in, encourages Bellamy not to punish himself for what he did,
starts studying doomsday cults (so random, I know), leads them on a wild goose
chase for a totally plausible bunker so easily found even though they have no map, just so happens to overhear a Grounder prayer that, amazingly, leads him
to believe there is ANOTHER bunker somewhere else (because, you know, he would
have totally had another one if he were in charge), convinces Kane, grabs
Monty, they haul it to Polis, he shows no problem with Indra gunning down
innocent guards (the woman is traumatised by what Pike/Bellamy did –
should we tell Jaha to shove his advice to Bellamy up his arse?) because
DAMMIT, he’s on a mission and this is just trivia, and whoomp, there it is, the
magical hole in the ground (Alice, anyone?) and thanks be to Frodo – I mean,
Monty – we now know the password to enter the Underworld.]

PS: I’d still like to know how Becca’s home/lab are still so pristine and have power and running water after a century.  I’d also like to know if there’s more at the house we could learn from. No one seems interested in investigating it, though.  Eh.  Her unlikely ‘crypt,’ though.  Is anything really going to come from it?  This show loves its dead ends.