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So i was reading this guide to set up a router on Ubuntu. I want to install a router on a virtual Machine with Ubuntu Server OS to get a better understanding of port forwarding and plan on connecting 3-6 other virtual machines to the virtual router. The virtual router will be connected via bridget adapter with my real router and with the other virtual machines. In this guide(https://www.ascinc.com/blog/linux/how-to-build-a-simple-router-with-ubuntu-server-18-04-1-lts-bionic-beaver/) i was reading step two is "Setting up a DHCP Server" and the second sentence say:"We really don't want to configure each client with static IP within the LAN network." And i am wondering why?
I found the Topic "Pros and Cons of having DHCP on L3 switch"https://www.networking-forums.com/routing-and-switching/pros-and-cons-of-having-dhcp-on-l3-switch/15/ and found this statement there without any further explanation

In my opinion having DHCP in switch is a best hassle free way to provide IP to the systems, i don't think there is no any cons.

In small environments, you are correct. In larger environments, it's not a very manageable arrangement.

I thought it would be easier for my Project to configure static IP adresses for each of my servers, as far as i would have easier overview if everything communicating properly. And i have a hard time understanding why a DHCP system (not on a switch) would be harder for a larger environment.
What is your take on this topic?
What are some advantages/ disadvantages of static IP vs DHCP from your experiences?