Do people not care about the raid boss?
Whenever there are more than one Tier 5 raid boss, people will stop posting into Discord what Mon it is. They schedule a raid, do the raid and never post what raid boss it really is.
There is always a raid boss of the two that I prefer and I can't see all 180 gyms in town so I have to rely on people posting the raid boss. As a consequence, it is kinda hard to do the preferred boss raid.
However, most people just go to a level 5 raid, many times do not split into teams and tap away at the screen without even looking.
Then they will continue doing a raid tour of 4-10 raids a day.
Why would you do about 90 to who knows how many raids a month without even caring about what the boss is? Rare Candy is nice, but apart from that what's the fun in all that?
Answers
Yes, Latios and Latias are more or less useless since we already have 3 Dragons that are stronger. However, I think you are wrong about Ho-oh. It has excellent stats and performance. Moveset is not ideal (that can change), but it's still a bulky beast especially boosted by either sunny or windy weather. It will be one of best counters against Regice with Steel Wing and Fire Blast in the summer and it's an excellent gym sweeper as well. It's a top 5 legendary for me at the moment and other than that especially the shiny variant looks great.
If you are in N. America then your options are Ho-oh: a retread that you've probably already raided and maybe even powered up already (motivation: shiny or more candy to power up your current Ho-oh) or Latias: a worse version of the legendary you just raided for an entire month (motivation: maybe? candy? so you don't have to use RC to get to lv30?)
Mainly for candy and a chance to get charge TM
I am lucky in this Latios and HoOh raid as i have a IV 98 Latios and 98 shiny Ho Oh in the beginning.
After that, i still go to gym raid with my group, but only join the raid when some trainer wanna try shortmaning it (3-5 trainer depending on the moveset)
Or if we split by color and one team short on trainers (usually Instict), i offer to join them eventhough i am a valor..
Latios or HoOh doesnt really mater for me, as i am looking for fun in shortmaning the T5 raids
I dont do speed raid when we just raid as much as possible in one day anymore, kind of boring for me after some time
Better just do a few legendary raid at weekend but the raid battle is enjoyable ( i only can go to our group raid area and raid together at weekend, at weekdays i play 1-2 raid solo)
I power and setup my pokemon, so i want to test how good they are
Yes, described players dont care. They dont even need the rare candy or TMs anymore. They are addicts.
I did 650 Raids myself (2/day). Which is much but nothing compared to the hardcores.
And it's enough. I dont even know what to do with the rare candies anymore. In total I could max 18 Legendaries (no dust), TMed every pokémon down to 2k CP and still threw away 100+ fast TMs.
I will continue to do the free raidpass of course but probably mostly with a T3 boss, to not be dependant on others.
For now Ho-oh vs Latios, I prefer Ho-oh cuz shiny. But Latios is also good so I would do both. But if I was in a Latias country there is no way I would waste a raidpass for it.