I mean, it's completely wrong, but i think i get their thinking with this.
The point is to get everyone to push everything to R9-10.
When they went with the relic system, people generally took their toons to R5-7. With the addition of R8 and R9 fewer and fewer people took their toons to those level. The vast majority of people have but a handful of R9's prior to the update. Yeah, 9's were hard and expensive to get, triply to so if you weren't in a high end guild. That made it nearly impossible. But, buy and large, it wasn't required - except for certain events (legendary, GL) to get toons to 8 or 9, so, generally, people didn't. And, yeah, i know people will want to chime in here with the huge numbers of 8's and 9's they got. And it isn't to say there aren't those who did. It's just those who did were the vast minority, not remotely close to the majority. Maybe those in K1 or 2, but that's about it.
Clearly, all they care about is how much they can force out of people's wallets. Quality and enjoyment aren't anywhere near they top of their list. I don't think that's the developers though, that's the people above them. You'd think with a game so far in the black they could make everything free for the next few years and still be in the black, they'd be fine with the status quo, but no. It's how far can we open the wallets before they walk away. I think they're finding out.