I just wanted to give my two cents. I'm a very casual player and the option to purchase what I want (literally just one subclass) has worked wonders. Sure if I purchase everything one by one from a source book it would be more expensive than the one book outright, but the option for me to make those decisions is what is important to me. I could absolutely spend just as much or more for a variety of things throughout the whole span of several sources which is great for a player like myself. But now with the changes, I don't want nor will spend my money of a whole source where I only use one thing. 

Please revert the changes. It just deters me and many others from spending our money on your products. Especially for someone as casual as I am, I couldn't care less about everything else in the source book apart from the one subclass from various source books.

Didn't even realise this was a recent change. Just got back into D&D to learn 5e and brush up on new DM stuff (last played 3e) and found D&D Beyond on mobile looking for some companion stuff so I could work on sheets and have a handy set of digital dice everywhere I go. Was really confused why every class and race I picked only had access to one singular feat, or why a decent chunk of subclasses were basically nonexistent, and upon checking the shiny red button that told me to check out the marketplace... it was just the books; I figured this was a bug or something, so I looked for some place on the site that looked like somewhere to update the compendium I had access to... Nope, just books and merch. I assumed it was just broken on mobile and tried the same thing as OP - same result as last, incomplete options and nowhere to get anything beyond the usual products. Now I've found this topic, and it appears they DID sell bits and pieces to update an incomplete compendium, but just recently decided to just not anymore, which sucks because I basically would have to pay for another book I already just recently bought to use a service that, in my humble opinion, could have just been completed in the first place, offering additional stuff like digital books as an extra. Kinda blows my mind, because the digital sheets make character creation way more efficient than just writing stuff down, so you'd think they'd at least try and capitalise on it like any other mobile app. I mean, I guess I got Myth Weavers as an alternative, and I can just crack open my books to check stuff, but man was this kinda digital approach concept neat.

Yeah, this really pissed me off when I realised it. Like, I'm happy to pay a few quid for just the races or just the monsters, cause that's a fair price. I'm all for creatives getting paid after all. But having to buy the whole book on my budget just isn't doable. It's like Hasbro or whichever knuckledragger designed this system has never heard of customer loyalty. It's like the relationship between players and DM's: if one is being an ass, the other will go have their fun somewhere else.

This sucks. Trying to get a new friend to join a campaign, now his choices are severely restricted. He would have dropped a bit of cash to make the character he wanted, now he's unsure if he wants to play as he would need two books to make the character he wanted.

There are copious threads discussing this topic, something the original poster is aware. 

While it's understandable that people want to voice their opinions on this subject, please use one of the many existing thread. Too many threads becomes disruptive

As such, this thread will be locked