Those legacy connectors (AV, SCART, S-Video, RF Modulators etc.) have had a superior replacement with no compromises though, HDMI.

The 3.5mm jack hasn't really had a viable replacement IMO, and to be honest I don't think it needs one. Personally I use bluetooth headphones when I'm out, usually switching it off in shopping environments (see #1 below) but indoors everything is 3.5mm.

My main problems with the omission of the 3.5mm jack are...

• privacy: Beacon trackers can follow you through a store by monitoring the bluetooth packets between your phone and headphones
• Limited spectrum space: if you've been on public transport where everyone is wearing BT headphones, the signal is terrible. Newer versions of BT are much better at frequency hopping compared to the old ones, but it's still not a great listening experience
• interference: retrofitting/replacing a perfectly good sound system just to add Bluetooth capabilities isn't realistic for everyone. Most of the retrofit BT recievers add unnecessary interference to a sound setup, and this gets worse if you need a longer cable to put the aftermarket reciever somewhere to get a better BT signal for your phone
• dongles: they're a solution, however IMO it's a bit of a janky one that puts unnecessary strain on your charging port when you're out and about. They also may consume more battery life (external ADC via USB, if your device/headphones/dongle does not support amplifying audio directly over the C port) and even more jank when the headphone cable is weighing down the dongle. In something like a car, or maybe home too, these dongles are OK, but they're a non starter for people who like to go out and about.

My biggest issue though is the planned obselecence stuff. The tiny li-ion batteries in the buds being pushed by manufacturers as a "3.5mm replacement" are likely going to get their recharge cycles rinsed out with frequent usage, leading the consumer to buy new buds every 2 years, just like with phones. It's really disappointing.