"But without a "legacy IT" constraint, what's the compelling spreadsheet model for a YC company to choose a mainframe?" The most compelling reasons for the mai

"But without a "legacy IT" constraint, what's the compelling spreadsheet model for a YC company to choose a mainframe?" The most compelling reasons for the mainframe, based on its intrinsic values, are 'RAS' (reliability, availability, serviceability). However, those virtues come with a very high price tag. So far the most part, I cannot imagine any startup business choosing one (UNLESS system downtime will kill the business).