Their players don't have any ambition. Like, Japanese and Korean are one of the most easiest to learn if you know how to speak one another. There's a winning region right next to you. if you want to win, start learning Korean, or English, and go abroad. You see plenty of Koreans playing outside of Korea already in Valo. Saya was already playing in NA and was winning even before franchise. We've seen Americans playing in APAC of all places, and some in EMEA. Some EMEA players in Americas, too.
As for Japanese players, I haven't heard once that their players are looking to find a team abroad or have attended a tryout on a foreign team, so that could play in a winning roster. All they care is to cruise and coast on comfy Japanese orgs, collecting paychecks and building fanbase so that once they retire, they've got a nice place to fall back on. Sayin "NT" and pat themselves in the back once in a while whenever they shit the bed and bomb out of whatever tournaments.
Like, the amount of players who want to stick to T2 is already crazy enough. When your are in a team like RID, I get it. There seems to be a real chance in winning Ascensions and challenging for the spot in the International League. Other than that, if they feel they are good enough but keep playing on T2 'because there's no spot in either Zeta or DFM', welp, what should I say?
Even in LoL, a Japanese player, who's from the region that is by far one of the weakest, a region absolutely deserted up until recently, went to LEC to take his chance, nearing 30 years of age, married and with child, leaving his family behind back in Japan. That is what you call pro-gridnset, the urge to win. I don't see any Japanese Valo players doing that.