Python version mismatch is the #1 cause of installation failures. Python mismatches, Torch errors, AMD GPU confusion, and low VRAM limitations trip people up even in 2026. Installing and maintaining ComfyUI or Automatic1111 locally is not easy.

Choosing from thousands of models and LoRAs, understanding their differences, and managing disk space (models are 2-20GB each) overwhelms newcomers. The abundance of choice becomes a burden rather than a benefit.

SDXL needs 8GB VRAM minimum, SD3 demands 20GB+ VRAM, and FLUX requires 12-48GB VRAM. Running locally requires NVIDIA RTX 4080 ($700+) or RTX 4090 ($1600+). Users without proper hardware face slow generations or inability to run newer models.

Flux.1 from Black Forest Labs is now recommended ahead of Stable Diffusion 3.5 for most tasks. Flux consistently produces better results on photorealism, text rendering, and prompt adherence. SD users feel left behind as the quality battle shifts.

Hands and intricate poses frequently generate with errors. While ControlNet mitigates this significantly, it adds another layer of complexity. Complex spatial relationships with multiple objects remain challenging without guidance tools.

For users who can't run locally, SD3 API costs 3.4x higher than SDXL. The jump in resource requirements between model versions means cloud costs scale significantly. Heavy API users find costs add up quickly.

While Automatic1111 is simpler for beginners, ComfyUI has a steeper learning curve with node-based workflows. Users struggle to get perfect settings, and unlike cloud tools, there's no simple 'type and generate' interface out of the box.

While SD3.5 has outstanding text renders, text rendering remains problematic in SDXL - improved but still unreliable for precise typography. Users wanting text in images need to use specific models or post-process results.

While NVIDIA GPUs work smoothly, AMD GPU users face confusion with ROCm setup, limited model compatibility, and performance issues. Many guides assume NVIDIA, leaving AMD users troubleshooting alone.

Unlike Midjourney or DALL-E where you type and generate, Stable Diffusion has fragmented interfaces: Automatic1111, ComfyUI, InvokeAI, Fooocus, etc. Choosing and learning the right UI adds friction before generating anything.

After successful installation, you must keep the software and custom nodes up-to-date. Model updates, dependency conflicts, and breaking changes require ongoing maintenance. What worked yesterday may break after an update.

Stability AI faced leadership changes (CEO Emad Mostaque stepped down in March 2024), cash flow concerns, and internal restructuring. While they've since stabilized with new leadership, the uncertainty worried users about long-term development.

Getty Images sued Stability AI over training data, alleging unauthorized scraping. SD outputs bearing Getty watermarks were cited as evidence. While Stability won the UK case, ongoing legal battles create uncertainty for commercial users.

The open-source nature means SD is used for generating NSFW and problematic content that would be banned elsewhere. While this isn't a technical issue, it creates ethical concerns and reputation problems for the ecosystem.

Being open source means no official support channel. You rely on GitHub issues, Reddit, Discord communities, and tutorials. Complex problems may go unsolved if the community can't help, unlike paid tools with support teams.