I have not judged anybody, just what constitutes difficult about being a single parent and it's not xmas trees which really don't matter (SPACE)
when I was a newly single mum, I didn't do any devs or tree. I was too tired, to overwhelmed, too depressed. Then I felt guilty for not doing it, as I was disappointing my child, not being the parent she deserved etc. The question of a tree and all it symbolises caused me utter misery.
Wind on a few years, I am mentally more stable and realise kids need safety and security and love, not Christmas trees to be ok.
However, for me a tree is important for my kid. We have a very small plastic one, job done. Yes I would prefer a real, bigger one, but like others, I would struggle.
So space, maybe trees don't matter so much to you, but for many it symbolises everything that is bad about single parenthood: the painful split up, the loneliness, the exhaustion, the guilt that you are not the parent your kid deserves, the deep seated desire to make Xmas a wonderful time just like it used to be.