When both parties start making appeals based on race then it is over. We will be fully tribal then. You espouse racism....
The Asian perception (in very many cases) is that the Republican party is a white club, that mainly speaks to and for white people.
There is a considerable diffidence and insecurity on the part of many Asians on this matter. There is a perception (not all that wrong) that they are held to be unwelcome in this country by Republicans.
There are very few Republicans speaking to Asians in Asian venues, and even fewer Asian Republicans doing so. And there are NO Republicans backing Asian issues, such as the shocking discrimination against Asians in college admissions.
Besides this a large proportion of Asians live in states that are dominated by Democrats, such as California. And nearly all live in big cities. The Asian view of politics is non-ideological. It is mainly a matter of power. There is no point backing Republicans if all that gets you is getting on the bad side of the people with power.
Complicating Asian outreach is that Filipinos are not Vietnamese are not Chinese are not Indians, etc. The various Asian groups don’t really talk to each other. They are not “Asian” in identity. They share locations and attitudes and interests but not identity.