I agree with this woman on only two well-known points. One, Bitcoin is really inefficient in terms of how speed a transaction can be done at least compared to Visa or Mastercard and there can be a problem with network congestion plus increasing confirmation fees at a time when there is a big volume of transactions - these are the things that Bitcoin has to improve a lot. However, people are using Bitcoin not really as a money but as a store of value like the physical gold so maybe for now there is no major issue here. Two, the mining of Bitcoin is costing us a big chunk of energy, so there is a big challenge to find an alternative technology that can lower the power requirement. I am looking at Bitcoin as a work in progress therefore we should be prodding developers to be more creative and use their ingenuity to make Bitcoin more modern and more efficient.
For the two "well-known" points, I would have to disagree that they may be "well-known" but not necessarily accurate.
First as far as the power consumption goes, one really needs to compare bitcoin's power consumption with the entire fiat ecosystem world wide, from the banks, branches, trucks to move fiat around, printing, paper, design, security, human cost in the ability of the power-hungry to skim off 3-300% of the value of everyone's assets every year, the millions of computers running at every place that handles fiat etc. So it is debatable which would be more power efficient.
Second, you need to clearly define this:
"...how speed a transaction can be done at least compared to Visa or Mastercard..."
Because if you truly mean "done" as in "completed" then bitcoin is many orders of magnitude faster since Visa and Mastercard can be reversed for months. Bitcoin reversed for, perhaps an a few hours if one got extremely lucky. If you mean "done" as in the transaction is started, then bitcoin and Visa/MC are fast and give the illusion of a transaction being "completed" when in reality it is similar to it being in the mempool. Lightning and other second level can make things significantly faster from a "initial confirmation" perspective and from an irreversibility perspective giving you both the confidence that it will instantly (1 -2 seconds) become locked in. Lightning is more akin to handing someone cash or having an irreversible credit card.
:-)