Rim protector is nearly always more important than a perimeter defender. Shaq did his job as a rim protector, averaging 2.5 blocks/game while keeping his defensive responsibility in check and keeping the opponent from having easy paths to the basket. He had big block totals and strong interior defense in each big series during the threepeat. In that 2000-2002 window, the only teams that gave the Lakers trouble were ones that put up a ton of midrange jump shots. There's a reason he made 3 All-Defensive teams in that stretch despite there being only two center slots and having to go up against Dikembe Mutombo, Alonzo Mourning, David Robinson, and Ben Wallace.
Perimeter defenders can only be more important when they're either a great team defender/defensive leader, or when they completely shut down an important #1 option. Kobe in 2000-2004 wasn't that. He was a better on-ball defender than a team defender, and he often had lapses. He wasn't the defensive leader, and he didn't shut down his primary responsibility in any major series. Like Phil said, he got by on spectacular plays that got attention, not on good consistent defense.
“Kobe’s defense, to be accurate, has faltered in recent years, despite his presence on the league’s all-defensive team. The voters have been seduced by his remarkable athleticism and spectacular steals, but he hasn’t played sound, fundamental defense. Mesmerized by the ball, he’s gambled too frequently, putting us out of position, forcing rotations that leave a man wide open, and doesn’t keep his feet on the ground.”
Here are the 7 top perimeter scoring threats that the Lakers faced in competitive series from 2000-2004. Tell me which one Kobe shut down:
15ppg on 58 TS% - Steve Smith regular season
18ppg on 61 TS% - Steve Smith against Lakers
18ppg on 60 TS% - Reggie Miller regular season
24ppg on 59 TS% - Reggie Miller against Lakers
18ppg on 55 TS% - Jalen Rose regular season
23ppg on 56 TS% - Jalen Rose against Lakers
31ppg on 52 TS% - Allen Iverson regular season
36ppg on 49 TS% - Allen Iverson against Lakers
14ppg on 51 TS% - Mike Bibby regular season
23ppg on 53 TS% - Mike Bibby against Lakers
18ppg on 52 TS% - Rip Hamilton regular season
21ppg on 50 TS% - Rip Hamilton against Lakers
17 ppg on 55 TS% - Chauncey Billups regular season
21ppg on 70 TS% - Chauncey Billups against Lakers
Outside of Iverson and Reggie, those aren't even 1st-tier scorers, yet they ALL got buckets against the Lakers. If Kobe was more valuable on defense than Shaq was, what the hell happened?