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I wouldn't pay $600 for the 32GB upgrade from Apple. I would buy the 8GB configuration from Apple that would take the price down to $1899 and buy 3rd party RAM. https://eshop.macsales.com/shop/memory/imac-2019-27-inch I refuse to use Slack or Outlook on my computer. I keep them both running on my phone.
Except the RAM is soldered on their laptops. It's company provided so I rather not argue against a laptop, plus I am effective in using it anyway. I wish I could buy 3rd party RAM for a MacBook Pro unless they finally stopped soldering on the RAM recently, then I would love to buy a new MBP with my own cash if I can get a normal keyboard.
You would probably only save up to $200 on third party memory. Which is not nothing but if you get a 15 inch you’re already talking about $2400