Let's encrypt and ACME hasn't always been available. Lots of companies also use appliances for the reverse proxy/Ingress.
If they don't support ACME, it's actually quite the chore to do - at least it was the last time I had to before acme was a thing (which is admittedly over 10 yrs ago)
This is probably technically true, but setting up TLS properly on your server is really ridiculously simple.