Its also easy to forget that they have been doing it for a long time, even if you only bought 1 bit of gear a year after long enough you would have a stacked studio.
Also there was an era where you had to have a whole bunch of gear, it just wasnt possible to do this on a computer. Maybe thats how they got used to working and just prefer to continue that way.
I have a few bits of really nice kit but I am always conscious that right now, other people are making amazing music with a lot less. Enjoy working with what you have now and focus on making amazing music with the time you have.