A few examples of expected functionality from the official IKEA Home Assistant integration:
Additional features seeminly available through the deCONZ REST API / cluster, but also not exposed to Home Assistant:
{
"state" : {
"deviceruntime" : 95750,
"speed" : 20,
"lastupdated" : "2022-07-09T10:00:34.289",
"filterruntime" : 95750,
"replacefilter" : false
},
"lastseen" : "2022-07-09T09:59Z",
"ep" : 1,
"swversion" : "1.0.033",
"manufacturername" : "IKEA of Sweden",
"type" : "ZHAAirPurifier",
"uniqueid" : "cc:86:ec:ff:fe:83:25:fe-01-fc7d",
"lastannounced" : null,
"config" : {
"reachable" : true,
"locked" : false,
"filterlifetime" : 259200,
"ledindication" : true,
"mode" : "auto",
"on" : true
},
"modelid" : "STARKVIND Air purifier table",
"etag" : "33e4719fd2bfe58ece3303b818ade420",
"name" : "AirPurifier 187"
}
As originally reported here: home-assistant/core#74788 the IKEA Starkvind when paired through deCONZ with the deCONZ Home Assistant integration only exposes one (1) air quality sensor. deCONZ reports more clusters available, but these aren't available in Home Assistant.

Requested features
A few examples of expected functionality from the official IKEA Home Assistant integration:
Additional features seeminly available through the deCONZ REST API / cluster, but also not exposed to Home Assistant:
REST API:
Screenshots from deCONZ: