I don't think it will. Right now a good 4G connection is faster than many landlines in terms of downstream bandwidth (at around 80Mbps), so if you're building for the best connection available right now you shouldn't be limited compared to desktop.
Now the main thing that 5G should improve is latency which will be useful for real time apps and games... But most of those already expect you to be using wifi with a good landline anyway.
So yeah... From a user perspective 5G might mean more situations where you have the same experience as wifi+fiber, but I don't think it will change the way we build apps.
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I don't think it will. Right now a good 4G connection is faster than many landlines in terms of downstream bandwidth (at around 80Mbps), so if you're building for the best connection available right now you shouldn't be limited compared to desktop.
Now the main thing that 5G should improve is latency which will be useful for real time apps and games... But most of those already expect you to be using wifi with a good landline anyway.
So yeah... From a user perspective 5G might mean more situations where you have the same experience as wifi+fiber, but I don't think it will change the way we build apps.