I am doing it the "old" way
That's called fish-in cycling. Not 'the old way', it's only the old way cause previously fish in cycling was the only well known method.
I just wonder .....
Could it be that the modern way of fishkeeping is because you all seem to be using small internal/external filters? They might be more delicate than three inches of gravel, and two strong powerhead pumps? I don't really like the look of filters in a tank.
Has nothing to do with the filters... so long as you have enough filter media to have space for a large enough bacterial colony then it has nothing to do with anything.
We recommend fishless cycles as it make significantly more sense than fish-in. Fish-in almost always requires massive daily water changes and twice daily testing for the first few weeks. It also exposes the fish to ammonia and nitrite un neccesarily.
Weekly water changes are done because if you look at the statistics they show that weekly water changes = best results. Ie. fish spawn, live longer, show brighter colours, don't get ill as often.
The 'old way' is not the best way. The best way, regardless of when it was 'developed' is the one that firstly has the greatest success rates, and then following that one that also suits the fish keeper.
No one should stick to 'old ways' because they can't move with the times, but so long as the equipment is still capable (which it certainly should be... although where you managed to find an under gravel filter I don't know...) , then who cares.
I certainly don't envy you doing a fish in cycle though.