Don't worry a jot, Fizzly, but at some point u will hav to explain to him that he is exceptionally lucky in his ability to learn to read so easily and does not have to go through all the phonic stages most children need.
As Catkin said, The aim (of all reading instruction) in the long term is for everything to be read at sight - as we all do now.
Most children benefit from being taken to that stage in a methodical, plodding way, starting with basic phonics, then being introduced to other sounds for all the main spellings (man - many, on - only, etc.).
Because 69 English spellings have more than one sound (see list further down) phonics beyond the basic level, involves a lot of word level work anyway.
It is questionable whether children learn to read the likes of 'on - only, once, other, woman, women, who' by simply meeting them repeadedly in their phonics lessons or if they really learn the the different sounds for o and then go through them in their head when meeting new words .
My daughter learned to read pretty well by age 4 in much the same way that your son is doing and never proved a handicap of any kind.
I would not make a meal of any words your son stumbles over. Give him a few seconds to try and work it out. If he gives u the right first letter, just ask him to look at the rest carefully and sound it out for him.
The following list shows why phonics, in the sense of sounding out and blending letters into words, is by no means simple in English.
Many graphemes/spellings have more than one pronunciation. That's why phonics is an essential but not exclusive way of learning to read. Children need to practise word recognition as well.
The first word after each spelling gives u the main sound for it. - After the dash are examples of other sounds for it.
a: and – any, father, apron
a-e: gave – have
ai: wait – said, plait
al: always – algebra
-all: tall - shall
are: care - are
au: autumn - mauve
augh: daughter - laugh
ay: pays - says
cc: success - soccer
ce: centre - celtic
ch: chop –chorus, choir, chute
cqu: acquire - lacquer
e: end – English
-e: the - he
ea: mean - meant, break
ear: ear – early, heart, bear
-ee: tree - matinee
e-e: even – seven, fete
ei: veil - ceiling, eider, their, leisure
eigh: weight - height
eo: people - leopard, leotard
ere: here – there, were
-et: tablet - chalet
eau: beauty – beau
- ew: few - sew
- ey: they - monkey
ge: get - gem
-ger: anger - danger
gi: girl - ginger
gy: gym – gymkhana
ho: house - hour
i: wind – wind down, ski, hi-fi
- ine: define –engine, machine
ie: field - friend, sieve
imb: limb – climb
ign: signature - sign
mn: amnesia - mnemonic
ost: lost - post
-o: go - do
oa: road - broad
o-e: bone – done, gone
-oes: toes – does, shoes
-oll: roll - doll
omb: tombola - bomb, comb, tomb
oo: boot - foot, brooch
-ot: despot - depot
ou: sound - soup, couple
ough: bough - rough, through, trough, though
ought: bought - drought
oul: should - shoulder, mould
our: sour - four, journey
ow: how - low
qu: queen – bouquet
s: sun – sure
sc: scent - sceptical, luscious
-se: rose - dose
ss: possible - possession
th: this - thing
-ture: picture - mature
u: cup – push
ui: build – fruit, ruin
wa: was – wag
wh: what - who
wo: won - woman, women, womb
wor: word – worn
x: box - xylophone, anxious
- y-: type - typical
- -y: daddy – apply
z: zip – azure
Masha Bell