And lock yourself out of getting those bonus points?

(Once you get it through a convesion -- if you can, which I don't know -- you'd be locked out of apolying for it and getting all those many tens of thoussands of bonus miles.)

Also, I bet some of the other persk, like the lounge passes, would not necessarily come with a converison either.

And even if they allow you to convert, they may run an inquiry! (You can't prevent it, and the agent wouoln't necessarily accurately be able to tell you if it would happen. And even if it hadn't happened to some in the past, Chase could have changed policy since. Not that many people do conversions, so anecdoates of their experiences usually tend to be dated, which makes it more likely that htings could have changed between the time they had their experience and when you try it.)

So why all this effort to lose singup bonuses with so little payoff??? Why not just wait until you're ready to do another Chase app?

(Carry-on everything and the checked bag fees won't matter to you anyway. And it's not like you get priority seating or anything really super useful like that with the card, assuming you are carry-on only...)