As described, launching from enclosed harbour. 10hp four stroke, kill cord at all times. Carry oars, anchor, VHF, flares, navionics, fish finder, life jackets at all times (obviously, though the number of ppl I see there going out with their entire family on board on something sporty-looking with no life preservers or kill cords on is kind of shocking).
This isn't my first rodeo. I go out anything like a distance from the shore only on the sort of days I describe this Saturday above, which is 0.1m swell with a 7 second period. I can go out 2 miles in that weather, be seen still at all times by the many boats that come out on days like this (probably why I catch no fish lmao). Suspect I could probably just stand up and wave my arms and get rescued.
I disagree that my boat is easily swamped by wake, I frequently ride wakes from boats that must have over 200hp on the back and stay completely dry. I also disagree that people have difficulty seeing me on a "totally flat sea" - I see other SIBs from my own low deck without an issue at all at some distance. Obviously this worsens as sea state increases. One could argue that very close in shore is more problematic because of the chance of grounding and puncture, and in the case of engine failure, the horror of a lee shore.
None of which to say I am blase about any of this stuff, nor that the caution you advise isn't well founded, but one has to weigh risk with hazard. Risk really is probabilty of engine failure combined with simultaneous surprising shift in wind and weather. Or medical emergency. Actual problematic weather shifts that aren't accompanied by engine failure aren't particularly concerning because when I see that coming from afar, at two miles out I'll be back in the harbour before it turns up. I can expect the wind to get up somewhat without visual warning, but not to where swells will go to 2 meters high (which is what my boat is rated to). That sort of thing you see coming.
When I caught the mackerel and we didn't go down to St Tudwals 'cos there was a bit of chop, was a bit overcast, wasn't anything shocking, just meant we had to stick to displacement speeds, weather report said 0.5 meters and I didn't have my lad with me, but my m8 who is an experienced dinghy sailor. That's an example of risk management. We stayed where we were a half mile from the beach.
On the other hand, when my lad and I drifted over Gimblet Shoals, which is around two miles out, things were calm and we had several other, larger boats not far off doing similar things.
The reason I'm taking the time to answer this stuff, and please don't think I'm offended or something, it's all good advice
, but I frequently have people suggest that my SIB is just a coffin waiting to take me to Davy Jones locker or something. Folks on larger craft always seem to see smaller craft as deathtraps. A SIB is more seaworthy than something clinker built. With appropriate care and respect to sea conditions, it's perfectly fine.