Do you peg ground peg points on your tent?

Yes.

If/when it gets windy, you are at risk of having your tent deformed when things get pushed sideways.

Even with the "top" guys staked, the wind can loft and compress the tent. Once it settles, it won't "spring back" if the pole ends stuck in the dirt.

If is windy when you break camp corner pegs will keep the tent where it needs to be, rather than thrashing against the ground.

Necessary? No.

Potential for wind? Yes.

I always use the full amount of lines even if the weather is good.
For me its just good habit to be in.

It always use to seem that when I was lazy and didn't fully tie my shelter down would be the night that the winds would kick up.

I now always assume strong winds could happen.

One extreme case was when I was camping with a group. We went off to do a side trip after pitching camp and when we came back almost everyone's tent and gear was blown away. Many tents and sleeping bags were in the river.

Only mine and one other tent was still standing.
Everyone else thought their gear and sleeping bags would hold the tents in place if the wind picked up.

I never stake (peg) out all my points unless I know it will blow or snow hard.

EX. My TT Scarp 2 has 3 end stakes that must be used on each end.
And in case of a big storm->
…4 fly hem stake loops
…and 2 end and 2 side guyline tie-out points

If I stake out all of them every time I'd use 14 stakes! Not happening in mild weather.

Of course we can always use rocks and trees in place of stakes (pegs). Always a good choice (when available) if we expect a force 5 gale.

Yes, but also for another reason: with my tent it improves the ventilation and lessens the condensation.

I'd say it depends on the tent design. Most of my hiking experience has been with a tent that required four stakes to stand. Most so-called free standing tents I don't bother. I just use the minimum amount of stake-out points.

I always do. In the wind I want the tightest pitch I can get, and staking the floor out is part of that.

I exclusively use Mids and Flat tarps. I only use the the minimal staking required; 4-5 for mids or 6 for flat tarps in A frame mode. If I sense a breeze, want more space inside, more stability or want ventilation I will deploy extra stakes/guy line and spend the extra 5-10 minutes to get a tighter pitch. I always carry extra guy line so sometimes I will use sticks and rocks.

Putting stakes in at the base of the poles can help resist uplift as well as lateral deformity.

It would certainly reduce the amount of "work" the other stakes are doing.

If I'm in a high wind situation, there's no reason not to consider it.