It's mostly because the most economical way to get it is with an enterprise M365 sub, which many companies with under 1,000 users don't have. Even at that level, the unforseen need for additional premium licensing can dampen enthusiasm ("but it worked with my trial subscription!"). Besides, "low code" or "no code" is still programming, and requies that non-IT people to deal with unfamiliar concepts like software support, security and lifecycle management (or to ignore them at their own peril). Logic Apps are a whole other thing. More pro developers should give them a closer look if they aren't already using them.