Personally, I can't look at a time frame smaller than 15-minute. it's all preference and how much you want to be glued to your screens.
M1 only, I'd actually like S30 but sadly no can do with current platform, more detail the better for me, but scalper.
You can still use the smaller time frame for confirmation. For example if your trading system gives you a buy signal on the 1h time frame then you can use the 15 min chart for confirmation.
"The Trading Game: Playing by the Numbers to Make Millions" by Ryan Jones, I read it 20 years ago, great book!
Means nothing to me, my SL's would have to be huge, becomes more of a gamblers game out there also nearer to 50/50 which is good and bad.
Wider stops doesn't have to mean larger losses, you can reduce size. I trade anything from 1 minute to 1 day and i find the higher the timeframe the more margin for error there is in the entry's, resulting is less stop outs due to noise or fake moves that appear in the lower timeframes. For me its its also easier to have a risk:reward of 1:4 or even more on the higher timeframes, on the low timeframes i get 1:1,5 on average. There is no one way to do this right, whatever works for you is the best way.
Advantages and Disadvantages. M1, I can jump on intraday momo better and ride it, with a smaller SL so more profit for the same move, where as move on it's own likely not enough for you. Disadvantage, If I get a 100pt Spike against me with my call it 10pt SL, then I've took 10x's the hit I had bargained for ( I don't hold over news intentionally but happens ), where as same move with your 100SL even if near the 100SL your ownly looking at 2x's the expected loss, which is nothing. Where as I've had 50% of the account vanish in 2seconds!! Not prepared to leave trades on the table or over night, so Daytrade around life works for me, where as I guess not an issue for you. ( I'd still be checking every 5mins )