I highly rate washi as batter but he's one of the braindead batter when he bats with the tail, virtually no game awareness, zero focus on doubles, he doesn't know how to farm strikes and always expose the tailenders.
Good thing for India is that for now there won't be any substantial damage and overall happy with the batting effort, anything from here is bonus.
Washington Sundar has the same weakness as Ravichandran Ashwin. He can't take wickets in SENA grounds. So when he is playing in SENA countries, he is more of a batting allrounder. Now the question is whether his place in the team is justified or not. India already has one spin-bowling allrounder who is much better than Washington (Ravindra Jadeja). And as such, they have to more pace-bowling allrounder options (Nitish Kumar Reddy and Shardul Thakur). I would suggest the selectors to include one extra batsmen in the place of Washington.
Nah I don't buy this weakness argument. If you look at Ashwin trajectory he got better in SENA, specially Australia because he toured multiple times and made into playing XI for okayish number of matches. In 2 BGT series india won, he even outbowled Lyon but management never gave him a continuous run in England because of team combination. For spinners one odd match in long series does more harm in SENA.
Same with Washi, the more he play the better. Having said that, I have no problem with his development as cricketer, in fact he ticks lot of boxes except when he bats with the tail but to me it's looks like his problem is not technical but mental. He's talented but very quiet kid in the team and not proactive and assertive enough and somehow it shows when he stuck with the tail. Due to same reasons, at times he looks like a lost kid in field. Noticed many times in IPL and even in tests when he's taking wickets.