For me it’s the notification light you used to find on older phones, was particularly good to know if your phone was charged without picking it up
It’s more than just having to charge them I wouldn’t even really consider that much of a downside with how long they last. I haven’t yet ran out of charge before I was ready to take mine out. The actual downsides are- Wireless earbuds are expensive. The batteries in them wear out over time and you have to buy all new ones which is wasteful. Bluetooth adds a noticeable delay that sucks when watching video. My car doesn’t have bluetooth so I need a headphone jack for AUX. I have both and like wireless ones when I’m on the go but if I’m stationary wired don’t cause any problems.