A current-gen console is a five-to-seven-year investment in your downtime. You want to buy the right setup once—bundle, extra controller, done—instead of constantly buying accessories piece by piece later.
Console hardware follows predictable cycles. Timing your purchase around mid-summer flash sales or November holiday bundles often gets you that second controller or a blockbuster game thrown in for the standard base price, especially when retailers clear out older hardware revisions.
An intro window is a strict deadline, not free money. If you still have a balance after 18 months, the regular interest rate kicks in on whatever is left, making your setup much more expensive.