There was no 'in universe' explanation about why they stopped using the Type 1/A/cricket Phaser- the reason I gave was from an interview with the people creating the show.
We also have never had an in universe description of the differences between the different phaser models- in any of the series aside from (TOS) Captain Tracy mentioning that the Phaser 2's had swappable power packs- he wanted extras sent down to him along with the Phasers. Logically bigger is more powerful but we never see much difference in what they can do on screen. They do whatever the script needs them to do.
The type 2 wounds the Horta, the type 1 does not.
There doesn't seem to be any rhym or reason to this other than a throw-away comment. I still don't know for the lfie of me, from watching all of TNG, D.S.9. and Voyager (that last one was painful though) know what the two phasers and rifle do differently from each other. The phaser rifle seems to serve no other purpose than looking more dangerous and harking back to the old phaser rifle from
TOS.
Which reminds me, I seem to recall instances from the spin-off series where the power crystal in a phaser would run low or out, leaving somebody without a phaser arm. Rare, but I recall it.
Why?
If today we can carry extra gun clips with us, why can't an officer carry a spare power crystal with him, especially if he knows he'll likely be in a fight.
It's been a long time since I've seen
"Encoutner at Farpoint", but didn't one of them (Riker?) use a Type-1 phaser (not that the type matters here, I was just specifying) and shoot out a continuous blue beam to leavitate somebody? If I am thinking correctly, wouldn't this be a great weapon in a battle? Pushing away and throwing away enemies.
And now that I have it on my mind, I recall one of the
TOS Trek films having one or two breif scenes showing personnel pushing hover carts with stuff on them. If this ability exists, why doesn't it get used more often? Or ever again.
Here's a silly one: if Ro was forced to remove her earing, why then was Worf allowed to wear a sash? Unless I've forgotten and he had to take that off, too.
And now that I got my mind just tearing things to pieces, if you can't see (except that one moment in ST:TUC) a cloaked ship or detect it (unless using a tacyon field) but the ship is only invisible and not like the experimental cloak in
"the Pegasus", how the Enterprise just doesn't bombard at spaced intervals torpedos armed with some kind of material, like paint for example, that only serve to blow the material into space, which would hit the cloaked shi panjd make the outline visible, especially if it misses but the ship still has to pass threw some of the material. Some for a bombardment of gasses. There must be any number of clever ways to find a ship cloaked.
I'm thinking too much about it. I must stop now.