Hmmm...I can see all his points of view and as an 'old timer' myself I've certainly cycled tanks like that myself and know many people who still do.
However (and they're big 'howevers )...
Of course, it is perfectly possible to do a fish-in cycle and do it well and not lose any fish, but I'd still recommend fishless cycles.
As my 14 yo has just said, "thinking doing loads of water changes is more work than a few tests is just dumb"
However (and they're big 'howevers )...
Learning to test your water regularly is one of the most important skills in fishkeeping and is something every fishkeeper should be able to do, IMHO. Testing is easier and less stressful than the water changes a fish-in cycle entails....you need to do a lot of testing, learn how to read the test results, and understand what the tests are telling you. This shouldn't really be necessary when cycling with fish
I personally think that is utter rubbish. To expect a novice fishkeeper to read and understand signs of stress in fish is terribly unfair and if they get it wrong, it's too late for the poor fishiesOn top of all this, if you are cycling with fish and keeping up with the water changes, the fish will indicate stress to you much sooner than you'd read it on a test kit - and they'll actually indicate stress to you, rather than a test that says that there may be a stressful level of ammonia or nitrite in the water
Well, if you don't consider 50% daily water changes as 'work' compared to adding some ammonia and doing a couple of tests, then he may have a point...Cycling the tank with fish minimizes the work you need to do
Of course, it is perfectly possible to do a fish-in cycle and do it well and not lose any fish, but I'd still recommend fishless cycles.
As my 14 yo has just said, "thinking doing loads of water changes is more work than a few tests is just dumb"