I try to use an IKEA remote to increase brightness on button click for multiple lights at once using separate brightness_step functions (for each lamp one). For my Rf Link units it works fine as it brightness attribute is known when its off. My zigbee (Philips) and Tuya lights however, do only show the brightness when they’re on, and when pressing the button they simply remain off. Why the heck is this?
Does this cause any issues, or is it just a cosmetic issue of the brightness not showing up as an attribute?
No its an issue when the lights are off and are enabled with the brightness_step function. Lights where the attributes are not shown, will not turn on 
Yes, using brightness_pct = 0 to turn off makes things quite a bit easier for smooth lighting profiles.
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