Fully agree.
I started with Discharge tests but most chargers only list the discharged capacity, not the charged one (or show the charges capacity after discharge); and mostly you can choose the discharge current, only the charge current.
I have the C3100 and overall it´s an usable charger but the noisy fan annoys me.
Still the Vapcell S4 Plus is my No.1 in that price range.
You’re right. I use xtar vc4 plus nowadays. I tried to trick the charger applying 1.55 V to cell while charging to start discharging directly but I couldn’t succeed. I need to take out the cell as soon as it starts charging again to observe both discharged and charged capacity and it’s annoying.
Yep, I have also chargers which can´t discharge directly:
VC4SL (no comment)
Zanflare C4: Only via NOR Test, annoying because charge rate in this mode is only 300mA or 500mA (discharge can´t be adjusted, is the same as charge rate), no display about the charged capacity in this mode.
Accupower IQ338XL (similar to Liito kala Lii-500): After charge the mode can changed to Fast Test which start immediately to discharge (always 500mA) but you have to keep an eye on it because it starts to charge again after discharging and the dicharged capacity is lost.
If you interested in capacity test a Charger like the Vapcell S4+ or Opus BT-C3100 is a good choice
I have 3 analyzing charger, Hitek x4, Xtar vc8, Littokala lii500. they are all pretty good, all have pretty wide range of functions, if you need it for individual cells, vc8 and lii500 would be the ones to get, imo. if you need something more serious, to work with lead acid/nimh/nicd, you want a hobby charger. I like my x4 but it does have a problem correctly terminating charge for some nimh cells but not others (would not charge some tenergy cells correctly, would stop charging at about 1/3 capacity, but charges eneloops, tenergy centura, and pro just fine, and even other no name brands correctly).
I don´t know the Hitek, but the VC8 and and the Lii-500 have no discharge function. And the Lii is slow at grading, the VC8 very slow
I also used grading in the past, but a charge and discarge is better because I can see which capacity was charged and discharged
they all discharge, but unlike x4, others discharge as a part of capacity test. They do it slower, that is true, since they have nowhere close to heat dissipating capacity of x4. X4 has huge heatsink and several fans to dissipate the heat, (it also costs 4-5 times more than other two) individual cell chargers are basically sealed with no exposed heatsinks or fans. so they will always fall behind hobby chargers.
I mean discharge as a separate function, not inside a capacity-test 
I don´t know the prices in USA, but here a good charge-analyzer like the Vapcell S4+ costs ~ 50€. It has discharge as a separate function and bcan do a capacity-test. I would it prefer clearly if I had the choice between it, the Lii-500 and Xtar. It can discharge in bay 1 and 4 up to 1A and in bay 2+3 500mA. And it have no fan
Another benefit if it have a discharge-option is to choose the charge/discharge current; I think it´s a very rare feature to choose these parameters for capacity-test-mode. And especially Xtar-chargers lacks of options, I know it from my new VC4SL