Retired builder. Gutters are to control water and keep it away from the foundation so your crawlspace or basement remains dry. Gutters serve no purpose to protect a slab foundation if ground is properly sloped. They also increase the damage to a home. I repaired many homes with rotted fascia, soffits and OSB sheathing. I upgraded my other home with Hardie plank and ran a 4" metal drip guard under the steel roof when I installed the roof.
I was glad I only had a gutter over the garage, doors and lanai here. Saw a house over in Caroline last year that was for sale. The back had heavy fascia/soffit damage from a gutter that was no longer level and it was right under a large tree. I'm sure a ladder kept pushing it down.
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