Really? Do you realize how insane it is what you're saying? A "fully loaded" cost for a Falcon launch, including the cost of development and of course the debt SpaceX took on to get here, comes an eye-watering 2.9 BILLION dollars per launch (just shy of double the space shuttle's cost). Of that debt, Musk spent about 100 million per launch on materials, employees, development, ... and kept 2.8 billion per launch for himself and his investors (that's why it's such brilliant financial engineering, also that's how you become a trillionnaire). To just keep it's current valuation, SpaceX needs something close to 2000 launches per year, indefinitely, more than double their current pace. That market doesn't exist. There aren't enough people to pay for launching satellites to launch that many rockets. And ... that's disregarding that SpaceX has competitors that are ~2 years behind and don't have SpaceX debt load, and should be able to launch whatever you want in about 2 years at half SpaceX's $/kg.
Several of the already named startups had rockets that are reusable. You act like SpaceX is the origin, or the first working example of the idea of reusable rockets. They are not, and they are not a little bit short of that standard, but a reusable rocket flew to Space and landed over 60 years ago. SpaceX is an accounting/finance accomplishment, not an engineering accomplishment.
At this point in time, both Europe (Arianespace) and China (CASC) have bet money they can duplicate the effort, Europe at less than 1% of the money SpaceX spent. Of course they usually go to a little over 2 times their planned budget. In other words, should come out below 2.5% the budget SpaceX spent ... (but does that matter given that SpaceX is not profitable?)
The whole space shuttle program (where SpaceX got half its employees I might add) is not just an attempt at making reusable rocket motors work. It's a successful attempt at making reusable rockets work first try, in 1981 (first motor reuse 6 months later, same year).
The engines on the orbiter could be, and regularly were, reused. This was done on its first ever launch (and second, obviously). The first 3 engines that launched the first Space Shuttle Orbiter were reused. Now how's that for engineering? A class above SpaceX, with 50 years older tech?. Obviously those engines landed. And even the Space Shuttle program over it's entire life (30+ years) lost less engines to everything than SpaceX lost designing it's rocket before launching it's first rocket to orbit.
If you allow for pure demonstration flights you could even say the first demonstration of a reusable rocket launching to space (ie. above the 100km line) was NASA X-15 flight 90, by Joseph A. Walker on 19th July 1963. Joseph Walker landed that engine, and reused that very engine to do it again, by the way. Of course, that wasn't into orbit.
And one of the startups had a reusable rocket at its first ever launch too. All these efforts had problems. Yes NASA did this first try, but very expensively. The startup did it cheaper than SpaceX did (and it wasn't remotely close), but wasn't able to continue (lack of money). You could complain their rocket was way smaller, and didn't make it to orbit (made it to space though).
Critically, SpaceX engineering still falls into the "not good enough" category, as mean as that is to say. It does not have the kg/$ performance the market demands, and SpaceX is only destined for bankruptcy. Plus, given their debt load, it really can't take that long (let's say a decade, tops). Let me explain. There is a clear commercial standard, from the Iridium days. Replacing 4000 satellites in orbit every 5 years, forever, on the income you can get from such a network from subscriptions, is not commercially viable with SpaceX technology. And you could say, the math is clear: cheap enough only seems achievable with a "spaceplane" design, launching from an airstrip. That was the motivation for the Space Shuttle program, but they couldn't make that work. SpaceX uses 12000 satellites btw, so not only do they not solve the Iridium problem, they make it harder for themselves.
And despite your comment asserting the opposite, SpaceX isn't even trying (the cost curve "Spaceship" is on does not reach commercial viability, not that it would even matter given the debt load SpaceX has)
Oh and when it comes to Musk's usual promises vs performance? You know who launched a spaceship to Mars and who didn't? Blue Origin did. SpaceX did ... not.
There is no engineering axis, other than perhaps eventual scale, where SpaceX wins on the engineering.
And of course, Trump is really helping to destroy SpaceX by making it clear to Europe that access to SpaceX is contingent on Trump's seemingly somewhat unstable mood.