since no one else has replied about tonguing syllables: there are two thoughts about this. On some occasions, a player might want to change the syllable in order to play a rapid series of articulated notes, but have no particular desire to change how the note sounds: they want a set of identical semiquavers or whatever, played rapidly. This leads to something like d-g-d-g-d-g-d-g- because it's easier to do repeat this pattern rapidly than d-d-d-d-d-d-d- (so there is a practical, behind-the-scenes reason for thinking about different syllables when the difference isn't actually audible).
But on other occasions a player might actually want to emphasise different syllables. If you almost spit a "t" into a recorder, with quite a lot of breath pressure, you will hear a transient hissy noisy noise at the start of the otherwise pure note. There are some lovely jazzy pieces performed by the Formosa recorder quartet where the bass recorder player is doing this (I think) to imitate a plucked double-bass. It's surprisingly effective. Some of the Baroque masters wrote about using different syllables, and where they should be used. I think Hotteterre wrote some stuff on tu-ru as strong and weak syllables. Where the syllables do sound different, then obviously it's important to use the emphatic syllables on the emphasised notes.
"T", spat, is very strong and aggressive (try it). A gentle dooo (probably the default for most people) is much milder, but "d" still cuts off the air-stream altogether, as does "g". But if you try other consonants like "r" and "l", they don't stop the airstream permanently: one can voice an r or l and sing a note while the tongue is in the middle of making that consonant, so they're very mild and rather unreliable for articulation.
One of the difficulties with the old masters is knowing what they meant by the different consonants. I'm not sure that I have enough appreciation of how Hotteterre would have pronounced an "r" to benefit from what he wrote. That level of playing needs more brain-cells and more time than I possess.
This subject really needs someone who knows what they're writing about...