What crazy hard problems have his companies solved?

Spaceflight was solved decades before Elon was born. Reusable rockets weren't a hard problem--they were simply a problem the incumbents were unwilling to address because it would have massively cut into their revenues and profits.

Electric cars actually predated ICE cars. The issue with EVs was always the charging infrastructure, which Tesla solved...by simply throwing a lot of money at it. (Not hard, just resource intensive.) Their batteries are built by Panasonic.

Boring Co literally is just a used tunneling machine. They have literally not done anything with it except test it out below the SpaceX parking lot (and the innovation in boring would come not from the tunneling but with the post-tunneling construction of the tunnel walls, stations, dirt removal, and ultimate extraction of the boring machine).

Even at Paypal, their biggest innovation was developed by Musk's biggest pre-Paypal competitor (Thiel's company) before they merged to form PayPal.

Everybody including every other space CEO, people from all levels of NASA and pretty much everybody that is innvolved in Space is giving SpaceX top marks on innovation on almost every single level, production, operation, technology and so on.

But of course you know much better how simple all these things are. For you to disagree with that is just emberecing yourself.

The same applies in a lesser degree to your other comments. Do you seriously belive that the origonal EV in 1900 was the end of development and all Tesla did was 'throw money at it'? That is the hight of stupidity and you again wont find a single expert on the subject agreeing with you.

Also the battery chemstry is co-licenced by Tesla and Panasonic with the design of the cells and even part of the chemistry being inhouse at Tesla. Panasonic can not sell this technology.

So when you are spreading baseless FUD, at least get your information correct.

You seem to have lost all rationality in context to of this question.

  Reusable rockets weren't a hard problem

Armchair engineer over here

I'm willing to back up my statements with my existing login, and I don't need to be an engineer to read the history of resuable launch systems. They've been around since the 1960s, and space-capable launch systems were a thing in the 1980s. They were killed the first time around by the collapse of the USSR, and then again when the Iridium went bankrupt, eliminating the demand.

You have nothing to back up the statement that "reusable rockets are not a hard problem", and let me back up this claim of mine by pointing out that only partial reusability exists today. In addition I invite you to build reusable rocket systems, sir, since you have already claimed that the problem is "easy". You could make some good money solving that problem, and you would once and for all put this argument to bed.