Well...they've had 10 years to review it, but they only ever tried to repeal it. Your dear leader ran and promised you "something great". Then he had a Republican congress, that had 7 years to develop this great plan that he was sure the Republicans MUST have had, only to find that they didn't have anything, then came up with a much smaller bill that the OTHER side would have to read to see what was in it, but wouldn't let them read it. So he pulled the vote and told you to wait until after the 2020 election.
But here's the thing. Some Republicans had a problem with social security when it was passed. They didn't have to repeal it to tweak it. And some Republicans, including St Ronnie, were opposed to Medicare. And they didn't have to repeal it before they tweaked it. But they don't even TRY to tweak Obamacare. And here's the kicker....this great plan that Trump was touting? It needed to cover preexisting conditions. Obamacare does that. And it has to allow families to keep kids on it thru college. Obamacare has that. There's this "money saving" feature they'll want to have, but rather than work on that, they told you to keep paying those outrageous premiums for two more years. With no promise of what they'll do.....other than run against Obamacare in 2020.