I prefer not to complicate the mining and not contact the liquid, unless absolutely necessary. At certain points, liquid cooling allows you to overclock old ASICs very strongly and earn profit at an inexpensive price of electricity. But when liquid cooling increases costs and does not increase hashrate, then it is better to refuse it.
Also another reason would be for retailers , if want to mine from home garage to get rid of noise and get some heat in winter...ha
When the miner calculates the costs of communications and heating from mining, then most likely he will choose a good option for soundproofing the garage in winter. With such a system, you need to be a good plumber and electrician at the same time, because you will have to do a lot of things yourself. Otherwise it will be very expensive.