These two factors allow Tesla to continue building capacity to fulfill the market demand, whilst making it harder for existing FF producers to switch to EVs.
FF producers have had two decades to get on board, spend the money, take the lead and make it impossible for Tesla to become the company it is today.
FF producers did not do so.
As for saying that Tesla is making it impossible for other manufacturers to enter the EV market? If you recall, from around 2012 onwards, the pundits have been saying that it was impossible for Tesla to enter the market as
a) there was no market fort their product
b) the incumbents could crush them by lifting their little finger and outproducing them.
Reality has been very different. Tesla had to fight like hell to get to where it is today and Tesla nearly failed. That was in a market where EV demand didn't exist at the large scale, charging infrastructure was almost invisible and EV's were pretty much considered a curiosity.
New entrants, today, compete in a mature market where the charging infra is largely solved, where demand is high and the FF producers are slowly coming to realise that change is here, not just round the corner and their very survival is at stake.
Any new EV entrant, today, has to face those realities. Tesla cannot keep prices high, to damage their own chances, in order to give Nio or Lucent a leg up.
VW, having realised the danger they are in, has already gone all in and is producing vehicles which undercut Tesla. FCA, PSA, Kia and others are following suit very rapidly. Granted that their offerings are a poor reflection of Tesla vehicles, but a Tesla is out of the reach of at least 60% of the market.
Hence Tesla keeps dropping prices and will introduce a new vehicle which is much cheaper than the competition in general, without that vehicle being a cheap tacky box.
This is business. If Tesla does not cut prices it won't make it easier for new entrants, it will just hand the lead back to FF producers who want nothing more than to slow things down.