I don’t think offline storage will be coming to Tidal any time soon, as it’s primarily a consumer service.
On the other hand, Beatsource Link (assuming you’re an ‘open format’ DJ) does allow offline storage. It’s just not integrated into the Denon hardware yet.
If you’re DJing at all, regardless of pro/non pro, you should try and have at least some purchased music that you can play - just for safety. It’s NOT about being old (kradcliffe) it’s about having a backup plan. Things don’t always “just work”, no matter what they are.
this is a tired perspective — a service included in the product they paid for doesn’t work. Complaining about it is totally reasonable. “you also need to be prepared with backup tracks all the time otherwise stfu” is not helpful, is not empathetic, and is weirdly defensive.