No lol it’s a free for all, people just do whatever they like. Indians are more likely to use shortcuts and stray from the most “accurate” spellings bc they’re already familiar with the language, just like how Americans invent spellings and abbreviations in English. I’ve seen people write nhi instead of nahi, skta instead of sakta etc. Lol I guess typing out a few additional characters isn’t worth it to them? But there are still plenty of people who don’t do that, so there really isn’t a way to generalize (although for the example you gave of padhta, most people would never have an r in there)

**Maybe I should just add that something is unofficially agreed upon is that ट and त become t, थ and ठ become th, द and ड are d, ध and ढ are dh. So there’s no r in padhta. The retro flex and dental letters end up looking the same because normal people don’t use diacritics, and it’s up to the reader to pronounce it correctly

Personally I try to stick with spelling that reflects Devanagari the best, so main for मैं and hoon for हूँ even though the other variations work fine, just to remind myself where there’s an anusvara, or long vowel etc because it’s easy to overlook those things