I ran into this same problem a few months ago. Instead of taking the time to learn how to manage partitions and lvms, i just re-installed debian and put everything on the same partition because i had no reason to keep em separated.

I feel like i’ve seen someone ask this exact question here not too long ago. Was it you?

I did a debian install this weekend, and it seemed pretty mild. It asked if I wanted separate partitions for /tmp and /home and if I wanted to encrypt my lvm. Then I chose my desktop environment from a list and that was it. It even installed grub for me.