The assumption that it was related to insufficient investment isn’t supported by any evidence. Flawed technical decisions can be made by the most expensive engineers too.
Other potential and future entertainment partners Netflix will be working with e.g. WWE, will certainly see my view as they will be questioning Netflix's capability after that major streaming issue we both saw.
This isn't Netflix's first time they had this live streaming problem.
People will see this as an underinvestment from Netflix's part and they will reconsider going to a different streaming partner.
We will see why it went down and to what extent they underinvested in their post mortem.