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Debian 9 /boot && /boot/efi partition

Dear Debian users,
Recently I switched from QubesOS to Debian. The reason for this (just in case anyone wants to know) is because it was hard to combine the OS with the work I have to do for my school. While installing Debian I choose to use the following partition scheme:

nvme0n1                 259:0    0   477G  0 disk 
├─nvme0n1p1             259:1    0   512M  0 part  /boot/efi
├─nvme0n1p2             259:2    0   244M  0 part  /boot
└─nvme0n1p3             259:3    0 476.2G  0 part 
  └─nvme0n1p3_crypt     254:0    0 476.2G  0 crypt
    ├─laptop--vg-root   254:1    0  23.3G  0 lvm   /
    ├─laptop--vg-var    254:2    0   9.3G  0 lvm   /var
    ├─laptop--vg-swap_1 254:3    0  15.8G  0 lvm   [SWAP]
    ├─laptop--vg-tmp    254:4    0   1.9G  0 lvm   /tmp
    └─laptop--vg-home   254:5    0   426G  0 lvm   /home
As you can see there is a /boot and a /boot/efi partition. I was wondering the following things:
What is the reason this was automaticly done?
Does this have any negative influence on the security of my /boot partition?
How can I counter this?
And if it's possible to counter this, would it be profitable (in case of security) to counter it? 

Thanks in advance!
Kind regards,
Pieter  Lems