Should you always offer a monthly plan… or can you go straight to annual?

Hey PH! I'm a bit obsessed with Pricing, and just started testing a new experiment for my startup, @Pretty Prompt:

Remove the monthly tier; offer only Free or Yearly (basically no monthly plan available).

We decided to do this after doing some simple maths and seeing that 42% of users today choose annual vs our monthly plan.

So what if I can take out the monthly option entirely?

Has anyone here done something similar or has experience with this?

I think a big part of PMF is also a different type of PMF (aka Pricing Market Fit).

Does removing monthly pricing hurt conversion… or actually make pricing clearer and push more users toward longer commitment?

So then I did a bit of research:

• @Screen Studio
  Monthly + heavily discounted annual ($29/mo vs $9/mo billed annually). Clear push toward yearly. And no Free option. (BTW I LOVE THIS PRODUCT. I use it ~3/week and it's one I always recommend to others.)

• Send.co
  Free or $20/user/month. No annual plan. Super simple, low cognitive load.

• Fin (Intercom)
  Pay-per-outcome (~$0.99 per resolution). You only pay for value delivered, but costs can be harder to predict. I don't know how I'd feel as a founder implementing this today. Given that more people can ask more questions (cos form a user perspective, we all ask AI stuff all the time), I can only see this going up.

• @Basecamp
  If you want unlimited, it's a flat $299/month billed annually. Whether you're a small startup or an enterprise, they will never charge you more than that. (And they make it clear you get direct access to the CEO -> a great, great push for yearly).

Open to another pair of eyes! If you were designing SaaS pricing today, would you still include monthly billing by default, or less is more?