That doesn’t really work for portable (battery-powered) electronics where the user expects the device to power up relatively quickly and they generally get the impression its malfunctioning if it doesn’t. That’s not a very good look.
On top of that, the very same microcontroller used in this product can and DOES boot up near-instantly in other almost-identical products such as a trinket m0 or gemma m0 to name a couple, so it’s very likely within the capability of the product with the appropriate software/firmware.
Perhaps we can refrain from commenting if we don’t have anything helpful to offer the conversation? But seriously, thanks for calling us impatient when we asked for help, you’re so awesome!