This isn't a binary, just because those things are true, and because they tend to happen doesn't mean they are certainties or worth betting your whole net worth on. Anything could happen. There are outside market events to consider.
The answer is that you cannot do this because it is NOT TYPICAL. Plenty of tech IPOs flop but cognitive bias means you only remember the googles and apples and squares and not the 50% that go south of ipo price straight after launch.
The SEC filings from every company before their IPO contains more than enough data to evaluate their standings as a business, and are publicly viewable. There's a reason people know things, it's not all magic.