Starship is now Stacked

[David Hess]

They have already flow the falcon heavy with 27 merlin engines split across 3 cores.  29 larger engines on a single core is obviously a different situation but I think comparing to a 60 year old soviet rocket with a host of other issues and limitations is probably not very relevant either.

But other rockets displayed problems not evident when testing fewer engines, like pogo oscillation.

[iMo]

Sure, we cannot compare the rocket technology of that time, but at least they had similar launch towers (1969) 
More on its 30 engines issues on
https://www.popsci.com/this-rocket-failed-to-put-soviets-on-moon/
http://www.russianspaceweb.com/n1_5l.html

[mrflibble]

But other rockets displayed problems not evident when testing fewer engines, like pogo oscillation.

Some time ago there was mention of maybe doing a static fire of 9 engines first. Not sure what the current status of that plan is...

This one: "Depending on progress with Booster 4, we might try a 9 engine firing on Booster 3"
https://twitter.com/elonmusk/status/1417277335863140363