Yes to all the above. Pure sativas are getting rare, regular photo seeds are even getting rare, and hermie, auto and indica genetics are pretty much in everything out there now. And on purpose from the likes of GHS. Such is the fate of wind pollinated plants like corn (maize). But for a flip side to things here is a site that only has regular seeds, many of which are actually pure sativas. Try looking at regseed dot com. I have gotten several strains from them, and they are the real deal. Especially seeds from RSC (Real Seed Company). They have a large selection of landraces there as well.
As for seeds in wax, actually if they had a good amount of hash oil on them in the bud that hardened to resin they can last a lot longer. In which case you need to scratch the seed coat to get them to germinate. I use a nail file on my old seeds and scuff the seed surface before I put them in damp paper towels to germinate.
As for hash not having seeds, that was also the case in California until the late 1970s. We did not have any indica seeds, as indica all came in the form of hashish from Lebanon, Morocco, and Afghanistan. We had mostly seeded sativa strain colas bricked or loose or tied to sticks from Thailand, Colombia and Mexico. We also got seeds in weed from Panama, Jamaica, and occasionally other places in Central America and Central and South Africa, and SE Asian weed from Cambodia and Vietnam, and Kona and Maui weed from Hawaii. In the early 1970s some Afghani hybrid strains popped up in California, like Cali-O and California Red Bud. But they were rare. By the end of the 1970s indica hybrids started to become more common, like in skunk and S.A.G.E. By the 1980s things moved north to the Emerald Triangle, and lots of indicas became more prevalent, like Mendo Purps, Purple Urkle, and Humboldt. Northern Lights came out of the Seattle aea, and Blueberry came out of Eugene, Oregon. By the mid 1980s skunk, what would become known as Haze, Cali-O, and Durban Poison were all exported from California to Amsterdam, and the indica hybrid breeding went into high gear.
Funny, in 1982 my oldest brother insisted that my landrace strains were too common and inferior, and I should grow Nevil's Amsterdam strains. He had all the early Holland seed catalogs then. I pointed out to him that Nevil's genetics were all based on strains from Northern California, and I had seeds for them in the freezer. Also at that time, seeds were still commmon in weed, and so they were essentially free and thus worthless. So why would I pay $5 for a single seed, when I had hundreds of seeds on ice? Or I could buy a lid with seeds in it? So I continued to grow Mexican and Colombian landrace weed. Fast forward to a month ago and my brother emailed me saying that he has all the latest Amsterdam srains, and that clones are passe', and my landraces and heirlooms are all passe'. He is still hooked on the indica feminized hybrids from Holland. I told him to "go f* himself." I have not had much to do with that brother for over a decade. My other brother and I grow all my landraces and heirlooms from my seed collection, and some local clones. Passe' my asse'. My seeds and clones are in demand. My oldest brother has no clue that I have vastly expanded my original landrace, heirloom and clone collection.
Anyway, I will grow and smoke my Colombian and Kona Golds, and Maui Waui, Oaxacan, Durban Poison, and others. All sativa photos for the most part (Maui Waui is an exception, and a good early hybrid). I grew Blue Dream, GDP, White Widow and several OG cuts a few years ago just to see what all the hype was about. I was disappointed. It has for the most part all been rendered into hash oil and blended with oils and bees wax for skin creams. BTW: Freezing seeds is the way to preserve them long term. They can last virtually forever frozen at 0 deg F. Far better than wax. Short of freezing them, put them in the refrigerator in a sealed jar with dry rice. They should last for up to 10 years that way.