May I ask if you have bought and examined those files yourself? 🤔
I'm pretty sure that those who think that the 18.000 styles pack is good news will be disapointed.
Most of it is probably 'rubbish' collected from the web as well as converted stuff.
But it's nice sales trick, big amount for low cost. That's why people bite the bait.
But of course, it will drag people to the commersial PSR styles site. 💰
Anyway,
if people do a Google seach for i.e. Yamaha songstyles, there will be some nice finds. Even for free.
If they want quality files, they will not find it in such packs.

That said, it's quite a lot of work to find 18.000 different (?) style files, and it's even more work and time consuming for those that's going to buy and explore it.
It's always up to the potential buyer, but myself, I prefer to use the time to exercise and play the keyboards.
There is indeed a lot of QUALITY styles present there already, and when add Yamahas free addonpacks, you'll be busy for a looooong time.😁

Btw,
the Yamaha Musicians Forum do also gain a lot of new and knowledgeable members.
Many coming from the original PSR Tutorial, and Yamaha Musicians is not a commercial site.

https://yamahamusicians.com/forum/index.php

and Arranger the section:

https://yamahamusicians.com/forum/viewforum.php?f=97