To be fair to the OP it's a very good question and i will try and evaluate a bit.
From MY experience which is about 6-7 oral only cycles and that's vast amounts of dianabol and anadrol. This was when I first delved into the bid world of AAS.
I didn't want to touch needles because of the stigma attached to 'roid heads' so that's why I started on pills.
At the time I got great results (ha great results what an idiot) I blew up like a balloon thinking it was great. Obvious water retention but never the less I looked bigger and when starting AAS and still niece that's all you want.

But back to the OP I do think that oral only cycles could be possible BUT ONLY with very regular blood work, liver and kidney values etc
Suppression/shutdown on orals IMO is very person to person and going by how you feel is Bulls**t. You might feel ok but have major issues inside.

IMO doing oral only cycles is possible but shows an immaturity to the whole point of AAS in general. I agree with if your not prepared to inject then you have no business dealing with AAS. This is a lifestyle and everything that comes with it needs the upmost respect ESPECIALLY steroid use, correct use.