I see with some anxiety the Catalina questions posted here and elsewhere, in particular potential incompatibilities. It seems 10.15 is a horse of a different color.
My work machine is a good ol' iMac late 2011 which can only go up to High Sierra. But I am not quite ready to get the very latest one. I would love to, but insurances and taxes are snatching my money.
My 2015 should hopefully run Catalina, but frankly I don't see myself working on it's bitty 13 inches screen all day.
Is it viable to develop under High Sierra, and test on Catalina on the laptop ? What would be the possible drawbacks ?