It is true that self-custody Bitcoin is obviously the only "real" way to own Bitcoin, but it's nice to be able to invest without taxes for the money I leave in fiat. I'd rather have it tied to BTC than tied to inflationary fiat currencies. The rest, ofc, goes to buying actual Bitcoin.

I do both. But why not fill the tax free account with ‘bitcoin’.

That's what I did in 2013 with my leftover savings from the corporate job I left.

It worked out.