[dmkolobov]

If I had to guess:

1. lack of native GC, you had to roll your own by providing a runtime.

2. lack of tail-call elimination in V1 of the spec. This essentially forces you to trampoline everything.

[stassats]

> lack of tail-call elimination

But lisp doesn't need TCO.

[dreamcompiler]

Common Lisp doesn't technically require TCO but Scheme does.

IMHO a Common Lisp without TCO is not a serious tool because I cannot write tail-recursive code with it.

[bevr1337]

Whoa, what a surprising fact! I had not considered TCO in LISP was "nice to have." That's a good example where it's easy to hack but hard to make production ready.