Correct. The design tradeoff is dependent on knowing how much of a Lisp interpreter you need to build. For most sites, the answer is "none" and it's not worth degrading user experiences just in case your e-commerce site ends up needing the ability to also serve as a designer for Minecraft levels.

(Even if it does, there is no requirement to ship the heavy JS needed for the Minecraft editor to all the e-commerce product description pages.)