C-to-C is capable of much faster charging than A-to-C; the weird “C plug on phones but A plug on chargers” period was a mistake, plain and simple. For modern tablets with giant batteries an A-to-C charger would take much longer to charge.
You can use your ten year old charging brick if you want, the A-to-C from your old phone will still work with your new phone (unless you’ve bought a phone from a brand that decides that standards are for losers, like OnePlus, then who knows how fast you’ll be charging, but that’s on the manufacturers making their own USB-PD for ~reasons~).
C-to-C is capable of much faster charging than A-to-C; the weird “C plug on phones but A plug on chargers” period was a mistake, plain and simple. For modern tablets with giant batteries an A-to-C charger would take much longer to charge.
You can use your ten year old charging brick if you want, the A-to-C from your old phone will still work with your new phone (unless you’ve bought a phone from a brand that decides that standards are for losers, like OnePlus, then who knows how fast you’ll be charging, but that’s on the manufacturers making their own USB-PD for ~reasons~).