After trying about 4x IKEA Zigbee products, the issue is more likely that IKEA extended the Zigbee protocol to make it easier for non-technical users to pair switches directly with devices.
As an example - a new IKEA one button switch would not pair with HASS, but kept linking with an LED bulb 3m away! The fix was to factory reset the LED bulb, repair it with HASS, re-interview it with HASS, then try the IKEA button again.
The 5-button circular remotes work (some eat CR2032 - re-interview in their final location?), and the cheap mains plugs seem decent repeaters. Beyond that, battery out, WAIT, re-pair, re-interview, hope!
The new range of IKEA kit (not TRADFRI) is going to be interesting, but TBH, I’m holding back until Thread kit appears.