Because a 6 month delay can see the industry swap from excellent job opportunities to everything grinding to a halt for several years.
To give a personal example; when I was training airlines were so short of pilots that recruiters were waiting at CAA test centres to pounce on successful IR passes.
Throw in Gulf war 1 and Air Europe going bust and recruitment became glacial for about 5 years.
So, if you want to be on this boat, get on it asap.
I went a very slow route because I was essentially skint, but if I'd had access to funding and moved faster it could have made a huge difference. OTOH I had an interesting time in GA for 6 years and picked up a load of other skills that stood me in good stead. Including "how not to develop an expensive lifestyle" and "how to marry a non money grabbing leech"; life skills that I heartily recommend to any young pilot!