What's the rule of thumb regarding consolidating Utxo s after coinjoin? Seeing limited and guesswork-sounding info out there.

If someone coinjoins a single utxo of 1 BTC they may end up with big chunks but also smaller bits of 10k, 20k sats. Does reconsolidation of a few, or all, the private utxo completely defeat the privacy gains of coinjoining?

Secondly, the option to coinjoin disappears after 100% private is reached on Wasabi. Does that mean rejoining from that point is useless?