Alright so in TDEE calculators you have to put up several factors

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Alright so in TDEE calculators you have to put up several factors for it to do its work. Height, age, weight, how many times you exercise...

Its this last one that bothers me. In several of this calculators you are asked this, between the possible answers is 1-2 a week, 3-4 times a week, 5-6 a week or 7 days a week. The thing is, some natty guy could train 3 days a week, doing 1 hour sessions, but some olympic swimer could exercise 3 days a week too, and by exercise I mean go to the pool, swim a shiload of laps, and then go workout at the gym for 2 hours sessions.

Some natty guy coukd do hard work 6 days a week, and do a 3 hours extreme workout, but some fatty could also exercise 6 days a week, but instead of doing the above, he could just go for a walk every morning.

You guys get me? My problem with TDEE calculators is that they ask you to add the exercise you do per week to the calculation, but exercise 3 days a week could mean 2 different thing for 2 different peaple.

Keeping this in mind, can TDEE calculators still be trusted? Would this be the reason why so many skinnies and fattys hit plateus despite claiming to eat a lot, or eat way less than normal when bulking or cutting? How big would the margin of error of TDEE calculators be?